List of interstellar and circumstellar molecules

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This is a list of molecules that have been detected in the interstellar medium and circumstellar envelopes, grouped by the number of component atoms. The chemical formula is listed for each detected compound, along with any ionized form that has also been observed.

Detection[edit]

The molecules listed below were detected by spectroscopy. Their spectral features are generated by transitions of component electrons between different energy levels, or by rotational or vibrational spectra. Detection usually occurs in radio, microwave, or infrared portions of the spectrum.[1]

Interstellar molecules are formed by chemical reactions within very sparse interstellar or circumstellar clouds of dust and gas. Usually this occurs when a molecule becomes ionized, often as the result of an interaction with a cosmic ray. This positively charged molecule then draws in a nearby reactant by electrostatic attraction of the neutral molecule's electrons. Molecules can also be generated by reactions between neutral atoms and molecules, although this process is generally slower.[2] The dust plays a critical role of shielding the molecules from the ionizing effect of ultraviolet radiation emitted by stars.[3]

History[edit]

The first carbon-containing molecule detected in the interstellar medium was the methylidyne radical (CH) in 1937.[4] From the early 1970s it was becoming evident that interstellar dust consisted of a large component of more complex organic molecules, probably polymers. Chandra Wickramasinghe proposed the existence of polymeric composition based on the molecule formaldehyde (H2CO).[5] Fred Hoyle and Chandra Wickramasinghe later proposed the identification of bicyclic aromatic compounds from an analysis of the ultraviolet extinction absorption at 2175A.,[6] thus demonstrating the existence of polycyclic aromatic hydrocarbon molecules in space.

In 2004, scientists reported[7] detecting the spectral signatures of anthracene and pyrene in the ultraviolet light emitted by the Red Rectangle nebula (no other such complex molecules had ever been found before in outer space). This discovery was considered a confirmation of a hypothesis that as nebulae of the same type as the Red Rectangle approach the ends of their lives, convection currents cause carbon and hydrogen in the nebulae's core to get caught in stellar winds, and radiate outward.[8] As they cool, the atoms supposedly bond to each other in various ways and eventually form particles of a million or more atoms. The scientists inferred[7] that since they discovered polycyclic aromatic hydrocarbons (PAHs) — which may have been vital in the formation of early life on Earth — in a nebula, by necessity they must originate in nebulae.[8]

In August 2009, NASA scientists identified one of the fundamental chemical building-blocks of life (the amino acid glycine) in a comet for the first time.[9]

In 2010, fullerenes (or "buckyballs") were detected in nebulae.[10] Fullerenes have been implicated in the origin of life; according to astronomer Letizia Stanghellini, "It's possible that buckyballs from outer space provided seeds for life on Earth."[11]

In October 2011, scientists found using spectroscopy that cosmic dust contains complex organic matter ("amorphous organic solids with a mixed aromatic-aliphatic structure") that could be created naturally, and rapidly, by stars.[12][13][14] The compounds are so complex that their chemical structures resemble the makeup of coal and petroleum; such chemical complexity was previously thought to arise only from living organisms.[12] These observations suggest that organic compounds introduced on Earth by interstellar dust particles could serve as basic ingredients for life due to their surface-catalytic activities.[15][16] One of the scientists suggested that these compounds may have been related to the development of life on Earth and said that, "If this is the case, life on Earth may have had an easier time getting started as these organics can serve as basic ingredients for life."[12]

In August 2012, astronomers at Copenhagen University reported the detection of a specific sugar molecule, glycolaldehyde, in a distant star system. The molecule was found around the protostellarbinary IRAS 16293-2422, which is located 400 light years from Earth.[17][18] Glycolaldehyde is needed to form ribonucleic acid, or RNA, which is similar in function to DNA. This finding suggests that complex organic molecules may form in stellar systems prior to the formation of planets, eventually arriving on young planets early in their formation.[19]

In September 2012, NASA scientists reported that PAHs, subjected to interstellar medium (ISM) conditions, are transformed, through hydrogenation, oxygenation, and hydroxylation, to more complex organics — "a step along the path toward amino acids and nucleotides, the raw materials of proteins and DNA, respectively".[20][21] Further, as a result of these transformations, the PAHs lose their spectroscopic signature which could be one of the reasons "for the lack of PAH detection in interstellar ice grains, particularly the outer regions of cold, dense clouds or the upper molecular layers of protoplanetary disks."[20][21]

In June 2013, PAHs were detected in the upper atmosphere of Titan, the largest moon of the planet Saturn.[22]

In 2013, Dwayne Heard at the University of Leeds suggested[23] that quantum mechanical tunneling could explain a reaction his group observed taking place, at a significantly higher than expected rate, between cold (around 63 Kelvin) hydroxyl and methanol molecules, apparently bypassing intramolecular energy barriers which would have to be overcome by thermal energy or ionization events for the same rate to exist at warmer temperatures. The proposed tunneling mechanism may help explain the common observation of fairly complex molecules (up to tens of atoms) in interstellar space.

A particularly large and rich region for detecting interstellar molecules is Sagittarius B2 (Sgr B2). This giant molecular cloud lies near the center of the Milky Way galaxy and is a frequent target for new searches. About half of the molecules listed below were first found near Sgr B2, and nearly every other molecule has since been detected in this feature.[24] A rich source of investigation for circumstellar molecules is the relatively nearby star CW Leonis (IRC +10216), where about 50 compounds have been identified.[25]

Molecules[edit]

The following tables list molecules that have been detected in the interstellar medium, grouped by the number of component atoms. If there is no entry in the Molecule column, only the ionized form has been detected. For molecules where no designation was given in the scientific literature, that field is left empty. Mass is given in Atomic mass units. The total number of unique species, including distinct ionization states, is listed in parentheses in each section header.

Most of the molecules detected so far are organic. Only one inorganic species has been observed in molecules which contain at least five atoms, SiH4.[26] Larger molecules have so far all had at least one carbon atom, with no N-N or O-O bonds.[26]

Carbon monoxide is frequently used to trace the distribution of mass in molecular clouds.[27]

Diatomic (43)[edit]

Molecule Designation Mass Ions
AlCl Aluminium monochloride[28][29] 62.5
AlF Aluminium monofluoride[28][30] 46
AlO Aluminium monoxide[31] 43
Argon hydride[32][33] 41 ArH+
C2 Diatomic carbon[34][35] 24
Fluoromethylidynium 31 CF+[36]
CH Methylidyne radical[37] 13 CH+[38]
CN Cyanogen radical[28][37][39][40] 26 CN+,[41] CN-[42]
CO Carbon monoxide[28][43][44] 28 CO+[45]
CP Carbon monophosphide[40] 43
CS Carbon monosulfide[28] 44
FeO Iron(II) oxide[46] 82
H2 Molecular hydrogen[47] 2
HCl Hydrogen chloride[48] 36.5 HCl+[49]
HF Hydrogen fluoride[50] 20
HO Hydroxyl radical[28] 17 OH+[51]
KCl Potassium chloride[28][29] 75.5
NH Nitrogen monohydride[52][53] 15
N2 Molecular nitrogen[54][55] 28
NO Nitric oxide[56] 30 NO+[41]
NS Nitrogen sulfide[28] 46
NaCl Sodium chloride[28][29] 58.5
Magnesium monohydride cation 25.3 MgH+[41]
NaI Sodium iodide[57] 150
O2 Molecular oxygen[58] 32
PN Phosphorus nitride[59] 45
PO Phosphorus monoxide[60] 47
SH Sulfur monohydride[61] 33 SH+[62]
SO Sulfur monoxide[28] 48 SO+[38]
SiC Carborundum[28][63] 40
SiN Silicon mononitride[28] 42
SiO Silicon monoxide[28] 44
SiS Silicon monosulfide[28] 60
TiO Titanium oxide[64] 63.9
The H3+ cation is one of the most abundant ions in the universe. It was first detected in 1993.[2][65]

Triatomic (41)[edit]

Molecule Designation Mass Ions
AlNC Aluminium isocyanide[28] 53
AlOH Aluminium hydroxide[66] 44
C3 Tricarbon[35] 36
C2H Ethynyl radical[28][39] 25
C2O Dicarbon monoxide[67] 40
C2S Thioxoethenylidene[68] 56
C2P [69] 55
CO2 Carbon dioxide[70] 44
FeCN Iron cyanide[71] 82
Protonated molecular hydrogen 3 H3+[2][65]
H2C Methylene radical[34] 14
Chloronium 37.5 H2Cl+[72]
H2O Water[73] 18 H2O+[74]
HO2 Hydroperoxyl[75] 33
H2S Hydrogen sulfide[28] 34
HCN Hydrogen cyanide[28][39][76] 27
HNC Hydrogen isocyanide[77] 27
HCO Formyl radical[78] 29 HCO+[38][78][79]
HCP Phosphaethyne[80] 44
Thioformyl 45 HCS+[38][79]
HNC Hydrogen isocyanide[81] 27
Diazenylium 29 HN2+[79]
HNO Nitroxyl[82] 31
Isoformyl 29 HOC+[39]
KCN Potassium cyanide[28] 65
MgCN Magnesium cyanide[28] 50
MgNC Magnesium isocyanide[28] 50
NH2 Amino radical[83] 16
29 N2H+[38][84]
N2O Nitrous oxide[85] 44
NaCN Sodium cyanide[28] 49
NaOH Sodium hydroxide[86] 40
OCS Carbonyl sulfide[87] 60
O3 Ozone[88] 48
SO2 Sulfur dioxide[28][89] 64
c-SiC2 c-Silicon dicarbide[28][63] 52
SiCN Silicon carbonitride[90] 54
SiNC Silicon naphthalocyanine[91] 54
TiO2 Titanium dioxide[64] 79.9
Formaldehyde is an organic molecule that is widely distributed in the interstellar medium.[92]

Four atoms (26)[edit]

Molecule Designation Mass Ions
CH3 Methyl radical[93] 15
l-C3H Propynylidyne[28][94] 37 l-C3H+[95]
c-C3H Cyclopropynylidyne[96] 37
C3N Cyanoethynyl[34] 50 C3N[69]
C3O Tricarbon monoxide[94] 52
C3S Tricarbon sulfide[28][68] 68
Hydronium 19 H3O+[97]
C2H2 Acetylene[98] 26
H2CN methylene amidogen[99] 28 H2CN+[38]
H2CO Formaldehyde[100] 30
H2CS Thioformaldehyde[101] 46
HCCN [102] 39
Protonated hydrogen cyanide 28 HCNH+[79]
Protonated carbon dioxide 45 HOCO+[103]
HCNO Fulminic acid[104] 43
HOCN Cyanic acid[105] 43
HOOH Hydrogen peroxide[106] 34
HNCO Isocyanic acid[89] 43
HNCS Isothiocyanic acid[107] 59
NH3 Ammonia[28][108] 17
HSCN Thiocyanic acid[109] 59
SiC3 Silicon tricarbide[28]  64
HMgNC Hydromagnesium isocyanide[110]  51.3
Methane, the primary component of natural gas, has also been detected on comets and in the atmosphere of several planets in the Solar System.[111]

Five atoms (19)[edit]

Molecule Designation Mass Ions
C5 Linear C5[35]  60
NH4+ Ammonium Ion[112][113]  18
CH4 Methane[52][98] 16
CH3O Methoxy radical[114] 31
c-C3H2 Cyclopropenylidene[39][115][116] 38
l-H2C3 Propadienylidene[116] 38
H2CCN Cyanomethyl[citation needed] 40
H2C2O Ketene[89] 42
H2CNH Methylenimine[117] 29
HNCNH Carbodiimide[118] 42
Protonated formaldehyde 31 H2COH+[119]
C4H Butadiynyl[28] 49 C4H[120]
HC3N Cyanoacetylene[28][39][79][116][121] 51
HCC-NC Isocyanoacetylene[122] 51
HCOOH Formic acid[116] 46
NH2CN Cyanamide[123] 42
HC(O)CN Cyanoformaldehyde[124] 55
SiC4 Silicon-carbide cluster[63] 92
SiH4 Silane[125] 32
In the ISM, formamide (above) can combine with methylene to form acetamide.[126]

Six atoms (15)[edit]

Molecule Designation Mass Ions
c-H2C3O Cyclopropenone[126] 54
E-HNCHCN E-Cyanomethanimine[127] 54
C2H4 Ethylene[98] 28
CH3CN Acetonitrile[89][128] 40
CH3NC Methyl isocyanide[128] 40
CH3OH Methanol[89] 32
CH3SH Methanethiol[107] 48
l-H2C4 Diacetylene[28][129] 50
Protonated cyanoacetylene 52 HC3NH+[79]
HCONH2 Formamide[126] 44
C5H Pentynylidyne[28][68] 61
C5N Cyanobutadiynyl radical[130] 74
HC2CHO Propynal[131] 54
HC4N [28]  63
CH2CNH Ketenimine[115] 40
Acetaldehyde (above) and its isomers vinyl alcohol and ethylene oxide have all been detected in interstellar space.[132]

Seven atoms (9)[edit]

Molecule Designation Mass Ions
c-C2H4O Ethylene oxide[133] 44
CH3C2H Methylacetylene[39] 40
H3CNH2 Methylamine[134] 31
CH2CHCN Acrylonitrile[89][128] 53
H2CHCOH Vinyl alcohol[132] 44
C6H Hexatriynyl radical[28][68] 73 C6H[116][135]
HC4CN Cyanodiacetylene[89][121][128] 75
CH3CHO Acetaldehyde[28][133] 44
The radio signature of acetic acid, a compound found in vinegar, was confirmed in 1997.[136]

Eight atoms (10)[edit]

Molecule Designation Mass
H3CC2CN Methylcyanoacetylene[137] 65
H2COHCHO Glycolaldehyde[138] 60
HCOOCH3 Methyl formate[89][116][138] 60
CH3COOH Acetic acid[136] 60
H2C6 Hexapentaenylidene[28][129] 74
CH2CHCHO Propenal[115] 56
CH2CCHCN Cyanoallene[115][137] 65
CH3CHNH Ethanimine[139] 43
C7H Heptatrienyl radical[140] 85
NH2CH2CN Aminoacetonitrile[141] 56

Nine atoms (9)[edit]

Molecule Designation Mass Ions
CH3C4H Methyldiacetylene[142] 64
CH3OCH3 Dimethyl Ether[143] 46
CH3CH2CN Propionitrile[28][89][116][128] 55
CH3CONH2 Acetamide[115][126] 59
CH3CH2OH Ethyl Alcohol[144] 46
C8H Octatetraynyl radical[145] 97 C8H[146]
HC7N Cyanohexatriyne or Cyanotriacetylene[28][108][147][148] 99
CH3CHCH2 Propylene (propene)[149] 42
Diacetylene, HCCCCH
Methyldiacetylene, HCCCCCH3
Cyanotetraacetylene, HCCCCCCCCCN
A number of polyyne-derived chemicals are among the heaviest molecules found in the interstellar medium.

Ten or more atoms (15)[edit]

Atoms Molecule Designation Mass Ions
10 (CH3)2CO Acetone[89][150] 58
10 (CH2OH)2 Ethylene glycol[151][152] 62
10 CH3CH2CHO Propanal[115] 58
10 CH3C5N Methyl-cyano-diacetylene[115] 89
11 HC8CN Cyanotetra-acetylene[28][147] 123
11 C2H5OCHO Ethyl formate[153] 74
11 CH3COOCH3 Methyl acetate[154] 74
11 CH3C6H Methyltriacetylene[115][142] 88
12 C6H6 Benzene[129] 78
12 C3H7CN n-Propyl cyanide[153] 69
13 HC10CN Cyanodecapentayne[147] 147
13 HC11N Cyanopentaacetylene[147] 159
60 C60 Buckminsterfullerene
(C60 fullerene)
[155]
720 C60+[156][157]
70 C70 C70 fullerene[155] 840

Deuterated molecules (17)[edit]

These molecules all contain one or more deuterium atoms, a heavier isotope of hydrogen.

Atoms Molecule Designation
2 HD Hydrogen deuteride[158][159]
3 H2D+, HD2+ Trihydrogen cation[158][159]
3 HDO, D2O Heavy water[160][161]
3 DCN Hydrogen cyanide[162]
3 DCO Formyl radical[162]
3 DNC Hydrogen isocyanide[162]
3 N2D+ [162] 
4 NH2D, NHD2, ND3 Ammonia[159][163][164]
4 HDCO, D2CO Formaldehyde[159][165]
5 NH3D+ Ammonium ion[166][167]
7 CH2DCCH, CH3CCD Methylacetylene[168][169]

Unconfirmed (10)[edit]

Evidence for the existence of the following molecules has been reported in scientific literature, but they have not yet been confirmed.

Atoms Molecule Designation
2 SiH Silylidine[77]
4 PH3 Phosphine[170]
5 H2NCO+ -[171]
10 H2NH2CCOOH Glycine[39][172]
12 CO(CH2OH)2 Dihydroxyacetone[173]
12 C2H5OCH3 Ethyl methyl ether[174]
18 C10H8+ Naphthalene cation[175]
24 C24 Graphene[176]
24 C14H10 Anthracene[7][177]
26 C16H10 Pyrene[7]

See also[edit]

References[edit]

  1. ^ Shu, Frank H. (1982), The Physical Universe: An Introduction to Astronomy, University Science Books, ISBN 0-935702-05-9 
  2. ^ a b c Dalgarno, A. (2006), "Interstellar Chemistry Special Feature: The galactic cosmic ray ionization rate", Proceedings of the National Academy of Sciences 103 (33): 12269–12273, Bibcode:2006PNAS..10312269D, doi:10.1073/pnas.0602117103, PMC 1567869, PMID 16894166 
  3. ^ Brown, Laurie M.; Pais, Abraham; Pippard, A. B. (1995), "The physics of the interstellar medium", Twentieth Century Physics (2nd ed.), CRC Press, p. 1765, ISBN 0-7503-0310-7 
  4. ^ Woon, D. E. (May 2005), Methylidyne radical, The Astrochemist, retrieved 2007-02-13 
  5. ^ N.C. Wickramasinghe, Formaldehyde Polymers in Interstellar Space, Nature, 252, 462, 1974
  6. ^ F. Hoyle and N.C. Wickramasinghe, Indentification of the lambda 2200A interstellar absorption feature, Nature, 270, 323, 1977
  7. ^ a b c d Battersby, S. (2004). "Space molecules point to organic origins". New Scientist. Retrieved 11 December 2009. 
  8. ^ a b Mulas, G.; Malloci, G.; Joblin, C.; Toublanc, D. (2006). "Estimated IR and phosphorescence emission fluxes for specific polycyclic aromatic hydrocarbons in the Red Rectangle". Astronomy and Astrophysics 446 (2): 537. arXiv:astro-ph/0509586. Bibcode:2006A&A...446..537M. doi:10.1051/0004-6361:20053738. 
  9. ^ Staff (18 August 2009). "'Life chemical' detected in comet". NASA (BBC News). Retrieved 6 March 2010. 
  10. ^ García-Hernández, D. A.; Manchado, A.; García-Lario, P.; Stanghellini, L.; Villaver, E.; Shaw, R. A.; Szczerba, R.; Perea-Calderón, J. V. (2010-10-28). "Formation Of Fullerenes In H-Containing Planatary Nebulae". The Astrophysical Journal Letters 724 (1): L39–L43. arXiv:1009.4357. Bibcode:2010ApJ...724L..39G. doi:10.1088/2041-8205/724/1/L39. 
  11. ^ Atkinson, Nancy (2010-10-27). "Buckyballs Could Be Plentiful in the Universe". Universe Today. Retrieved 2010-10-28. 
  12. ^ a b c Chow, Denise (26 October 2011). "Discovery: Cosmic Dust Contains Organic Matter from Stars". Space.com. Retrieved 2011-10-26. 
  13. ^ ScienceDaily Staff (26 October 2011). "Astronomers Discover Complex Organic Matter Exists Throughout the Universe". ScienceDaily. Retrieved 2011-10-27. 
  14. ^ Kwok, Sun; Zhang, Yong (26 October 2011). "Mixed aromatic–aliphatic organic nanoparticles as carriers of unidentified infrared emission features". Nature 479 (7371): 80. Bibcode:2011Natur.479...80K. doi:10.1038/nature10542. PMID 22031328. 
  15. ^ Gallori, Enzo (November 2010). "Astrochemistry and the origin of genetic material". Rendiconti Lincei 22 (2): 113–118. doi:10.1007/s12210-011-0118-4. Retrieved 2011-08-11. 
  16. ^ Martins, Zita (February 2011). "Organic Chemistry of Carbonaceous Meteorites". Elements 7 (1): 35–40. doi:10.2113/gselements.7.1.35. Retrieved 2011-08-11. 
  17. ^ Than, Ker (August 29, 2012). "Sugar Found In Space". National Geographic. Retrieved August 31, 2012. 
  18. ^ Staff (August 29, 2012). "Sweet! Astronomers spot sugar molecule near star". AP News. Retrieved August 31, 2012. 
  19. ^ Jørgensen, J. K.; Favre; Bisschop; Bourke; Van Dishoeck; Schmalzl; Favre, C.; Bisschop, S.; Bourke, T.; Dishoeck, E.; Schmalzl, M. (2012). "Detection of the simplest sugar, glycolaldehyde, in a solar-type protostar with ALMA". The Astrophysical Journal Letters. eprint 757: L4. arXiv:1208.5498. Bibcode:2012ApJ...757L...4J. doi:10.1088/2041-8205/757/1/L4. 
  20. ^ a b Staff (September 20, 2012). "NASA Cooks Up Icy Organics to Mimic Life's Origins". Space.com. Retrieved September 22, 2012. 
  21. ^ a b Gudipati, Murthy S.; Yang, Rui (September 1, 2012). "In-Situ Probing Of Radiation-Induced Processing Of Organics In Astrophysical Ice Analogs—Novel Laser Desorption Laser Ionization Time-Of-Flight Mass Spectroscopic Studies". The Astrophysical Journal Letters 756 (1). Bibcode:2012ApJ...756L..24G. doi:10.1088/2041-8205/756/1/L24. Retrieved September 22, 2012. 
  22. ^ López-Puertas, Manuel (June 6, 2013). "PAH's in Titan's Upper Atmosphere". CSIC. Retrieved June 6, 2013. 
  23. ^ http://www.sciencenews.org/view/generic/id/351444/description/Interstellar_chemistry_makes_use_of_quantum_shortcut#comment_351468
  24. ^ Cummins, S. E.; Linke, R. A.; Thaddeus, P. (1986), "A survey of the millimeter-wave spectrum of Sagittarius B2", Astrophysical Journal Supplement Series 60: 819–878, Bibcode:1986ApJS...60..819C, doi:10.1086/191102 
  25. ^ Kaler, James B. (2002), The hundred greatest stars, Copernicus Series, Springer, ISBN 0-387-95436-8, retrieved 2011-05-09 
  26. ^ a b Klemperer, William (2011), "Astronomical Chemistry", Annual Review of Physical Chemistry 62: 173–184, doi:10.1146/annurev-physchem-032210-103332 
  27. ^ The Structure of Molecular Cloud Cores, Centre for Astrophysics and Planetary Science, University of Kent, retrieved 2007-02-16 
  28. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am Ziurys, Lucy M. (2006), "The chemistry in circumstellar envelopes of evolved stars: Following the origin of the elements to the origin of life", Proceedings of the National Academy of Sciences 103 (33): 12274–12279, Bibcode:2006PNAS..10312274Z, doi:10.1073/pnas.0602277103, PMC 1567870, PMID 16894164 
  29. ^ a b c Cernicharo, J.; Guelin, M. (1987), "Metals in IRC+10216 - Detection of NaCl, AlCl, and KCl, and tentative detection of AlF", Astronomy and Astrophysics 183 (1): L10–L12, Bibcode:1987A&A...183L..10C 
  30. ^ Ziurys, L. M.; Apponi, A. J.; Phillips, T. G. (1994), "Exotic fluoride molecules in IRC +10216: Confirmation of AlF and searches for MgF and CaF", Astrophysical Journal 433 (2): 729–732, Bibcode:1994ApJ...433..729Z, doi:10.1086/174682 
  31. ^ Tenenbaum, E. D.; Ziurys, L. M. (2009), "Millimeter Detection of AlO (X2Σ+): Metal Oxide Chemistry in the Envelope of VY Canis Majoris", Astrophysical Journal 694: L59–L63, Bibcode:2009ApJ...694L..59T, doi:10.1088/0004-637X/694/1/L59 
  32. ^ Barlow, M. J.; Swinyard, B. M.; Owen, P. J.; Cernicharo, J.; Gomez, H. L.; Ivison, R. J.; Lim, T. L.; Matsuura, M.; Miller, S.; Olofsson, G.; Polehampton, E. T. (2013), "Detection of a Noble Gas Molecular Ion, 36ArH+, in the Crab Nebula", Science 342 (6164): 1343–1345, doi:10.1126/science.124358213 
  33. ^ Quenqua, Douglas (13 December 2013). "Noble Molecules Found in Space". New York Times. Retrieved 13 December 2013. 
  34. ^ a b c Lambert, D. L.; Sheffer, Y.; Federman, S. R. (1995), "Hubble Space Telescope observations of C2 molecules in diffuse interstellar clouds", Astrophysical Journal 438: 740–749, Bibcode:1995ApJ...438..740L, doi:10.1086/175119 
  35. ^ a b c Galazutdinov, G. A.; Musaev, F. A.; Krelowski, J. (2001), "On the detection of the linear C5 molecule in the interstellar medium", Monthly Notices of the Royal Astronomical Society 325 (4): 1332–1334, Bibcode:2001MNRAS.325.1332G, doi:10.1046/j.1365-8711.2001.04388.x 
  36. ^ Neufeld, D. A. et al. (2006), "Discovery of interstellar CF+", Astronomy and Astrophysics 454 (2): L37–L40, arXiv:astro-ph/0603201, Bibcode:2006astro.ph..3201N, doi:10.1051/0004-6361:200600015 
  37. ^ a b Adams, Walter S. (1941), "Some Results with the COUDÉ Spectrograph of the Mount Wilson Observatory", Astrophysical Journal 93: 11–23, Bibcode:1941ApJ....93...11A, doi:10.1086/144237 
  38. ^ a b c d e f Smith, D. (1988), "Formation and Destruction of Molecular Ions in Interstellar Clouds", Philosophical Transactions of the Royal Society of London 324 (1578): 257–273, Bibcode:1988RSPTA.324..257S, doi:10.1098/rsta.1988.0016 
  39. ^ a b c d e f g h Fuente, A. et al. (2005), "Photon-dominated Chemistry in the Nucleus of M82: Widespread HOC+ Emission in the Inner 650 Parsec Disk", Astrophysical Journal 619 (2): L155–L158, arXiv:astro-ph/0412361, Bibcode:2005ApJ...619L.155F, doi:10.1086/427990 
  40. ^ a b Guelin, M.; Cernicharo, J.; Paubert, G.; Turner, B. E. (1990), "Free CP in IRC + 10216", Astronomy and Astrophysics 230: L9–L11, Bibcode:1990A&A...230L...9G 
  41. ^ a b c Dopita, Michael A.; Sutherland, Ralph S. (2003), Astrophysics of the diffuse universe, Springer-Verlag, ISBN 3-540-43362-7 
  42. ^ Agúndez, M. et al. (2010-07-30), "Astronomical identification of CN-, the smallest observed molecular anion", Astronomy & Astrophysics 517: L2, arXiv:1007.0662, Bibcode:2010A&A...517L...2A, doi:10.1051/0004-6361/201015186, retrieved 2010-09-03 
  43. ^ Khan, Amina. "Did two planets around nearby star collide? Toxic gas holds hints". LA Times. Retrieved March 9, 2014. 
  44. ^ Dent, W.R.F.; Wyatt, M.C.;Roberge, A.; Augereau,J.-C.; Casassus, S.;Corder, S.; Greaves, J.S.; de Gregorio-Monsalvo, I; Hales, A.; Jackson, A.P.; Hughes, A. Meredith; Lagrange, A.-M; Matthews, B.; Wilner, D. (March 6, 2014). "Molecular Gas Clumps from the Destruction of Icy Bodies in the β Pictoris Debris Disk". Science (journal). doi:10.1126/science.1248726. Retrieved March 9, 2014. 
  45. ^ Latter, W. B.; Walker, C. K.; Maloney, P. R. (1993), "Detection of the Carbon Monoxide Ion (CO+) in the Interstellar Medium and a Planetary Nebula", Astrophysical Journal Letters 419: L97, Bibcode:1993ApJ...419L..97L, doi:10.1086/187146 
  46. ^ Furuya, R. S. et al. (2003), "Interferometric observations of FeO towards Sagittarius B2", Astronomy and Astrophysics 409 (2): L21–L24, Bibcode:2003A&A...409L..21F, doi:10.1051/0004-6361:20031304 
  47. ^ Adams, Walter S. (1970), "Rocket Observation of Interstellar Molecular Hydrogen", Astrophysical Journal 161: L81–L85, Bibcode:1970ApJ...161L..81C, doi:10.1086/180575 
  48. ^ Blake, G. A.; Keene, J.; Phillips, T. G. (1985), "Chlorine in dense interstellar clouds - The abundance of HCl in OMC-1", Astrophysical Journal, Part 1 295: 501–506, Bibcode:1985ApJ...295..501B, doi:10.1086/163394 
  49. ^ De Luca, M.; Gupta, H.; Neufeld, D.; Gerin, M.; Teyssier, D.; Drouin, B. J.; Pearson, J. C.; Lis, D. C. et al. (2012), "Herschel/HIFI Discovery of HCl+ in the Interstellar Medium", The Astrophysical Journal Letters 751 (2): L37, Bibcode:2012ApJ...751L..37D, doi:10.1088/2041-8205/751/2/L37 
  50. ^ Neufeld, David A. et al. (1997), "Discovery of Interstellar Hydrogen Fluoride", Astrophysical Journal Letters 488 (2): L141–L144, arXiv:astro-ph/9708013, Bibcode:1997ApJ...488L.141N, doi:10.1086/310942 
  51. ^ Wyrowski, F. et al. (2009), "First interstellar detection of OH+", Astronomy & Astrophysics 518: A26, arXiv:1004.2627, Bibcode:2010A&A...518A..26W, doi:10.1051/0004-6361/201014364 
  52. ^ a b Meyer, D. M.; Roth, K. C. (1991), "Discovery of interstellar NH", Astrophysical Journal, Part 2 - Letters 376: L49–L52, Bibcode:1991ApJ...376L..49M, doi:10.1086/186100 
  53. ^ Wagenblast, R. et al. (January 1993), "On the origin of NH in diffuse interstellar clouds", Monthly Notices of the Royal Astronomical Society 260 (2): 420–424, Bibcode:1993MNRAS.260..420W 
  54. ^ <Please add first missing authors to populate metadata.> (June 9, 2004), Astronomers Detect Molecular Nitrogen Outside Solar System, Space Daily, retrieved 2010-06-25 
  55. ^ Knauth, D. C et al. (2004), "The interstellar N2 abundance towards HD 124314 from far-ultraviolet observations", Nature 429 (6992): 636–638, Bibcode:2004Natur.429..636K, doi:10.1038/nature02614, PMID 15190346, retrieved 2010-06-25 
  56. ^ McGonagle, D. et al. (1990), "Detection of nitric oxide in the dark cloud L134N", Astrophysical Journal, Part 1 359: 121–124, Bibcode:1990ApJ...359..121M, doi:10.1086/169040 
  57. ^ Whiteoak, J. B.; Gardner, F. F. (1985), "Interstellar NaI absorption towards the stellar association ARA OB1", Astronomical Society of Australia, Proceedings (Sydney) 6 (2): 164–171, Bibcode:1985PASAu...6..164W 
  58. ^ Staff writers (March 27, 2007), Elusive oxygen molecule finally discovered in interstellar space, Physorg.com, retrieved 2007-04-02 
  59. ^ Ziurys, L. M. (1987), "Detection of interstellar PN - The first phosphorus-bearing species observed in molecular clouds", Astrophysical Journal, Part 2 - Letters to the Editor 321: L81–L85, Bibcode:1987ApJ...321L..81Z, doi:10.1086/185010 
  60. ^ Tenenbaum, E. D.; Woolf, N. J.; Ziurys, L. M. (2007), "Identification of phosphorus monoxide (X 2 Pi r) in VY Canis Majoris: Detection of the first PO bond in space", Astrophysical Journal, Part 2 - Letters to the Editor 666: L29–L32, Bibcode:2007ApJ...666L..29T, doi:10.1086/521361 
  61. ^ Yamamura, S. T.; Kawaguchi, K.; Ridgway, S. T. (2000), "Identification of SH v=1 Ro-vibrational Lines in R Andromedae", The Astrophysical Journal 528 (1): L33–L36, arXiv:astro-ph/9911080, Bibcode:2000ApJ...528L..33Y, doi:10.1086/312420, PMID 10587489 
  62. ^ Menten, K. M. et al. (2011), "Submillimeter Absorption from SH+, a New Widespread Interstellar Radical, 13CH+ and HCl", Astronomy & Astrophysics 525: A77, arXiv:1009.2825, Bibcode:2011A&A...525A..77M, doi:10.1051/0004-6361/201014363, retrieved 2010-12-03. 
  63. ^ a b c Pascoli, G.; Comeau, M. (1995), "Silicon Carbide in Circumstellar Environment", Astrophysics and Space Science 226: 149–163, Bibcode:1995Ap&SS.226..149P, doi:10.1007/BF00626907 
  64. ^ a b Kamiński, T. et al. (2013), "Pure rotational spectra of TiO and TiO2 in VY Canis Majoris", Astronomy and Astrophysics 551: A113, arXiv:1301.4344, Bibcode:2013A&A...551A.113K, doi:10.1051/0004-6361/201220290 
  65. ^ a b Geballe, T. R.; Oka, T. (1996), "Detection of H3+ in Interstellar Space", Nature 384 (6607): 334–335, Bibcode:1996Natur.384..334G, doi:10.1038/384334a0, PMID 8934516 
  66. ^ Tenenbaum, E. D.; Ziurys, L. M. (2010), "Exotic Metal Molecules in Oxygen-rich Envelopes: Detection of AlOH (X1Σ+) in VY Canis Majoris", Astrophysical Journal 712: L93–L97, Bibcode:2010ApJ...712L..93T, doi:10.1088/2041-8205/712/1/L93 
  67. ^ Ohishi, Masatoshi, Masatoshi et al. (1991), "Detection of a new carbon-chain molecule, CCO", Astrophysical Journal, Part 2 - Letters 380: L39–L42, Bibcode:1991ApJ...380L..39O, doi:10.1086/186168 
  68. ^ a b c d Irvine, William M. et al. (1988), "Newly detected molecules in dense interstellar clouds", Astrophysical Letters and Communications 26: 167–180, Bibcode:1988ApL&C..26..167I, PMID 11538461 
  69. ^ a b Halfen, D. T.; Clouthier, D. J.; Ziurys, L. M. (2008), "Detection of the CCP Radical (X 2Πr) in IRC +10216: A New Interstellar Phosphorus-containing Species", Astrophysical Journal 677 (2): L101–L104, Bibcode:2008ApJ...677L.101H, doi:10.1086/588024 
  70. ^ Whittet, D. C. B.; Walker, H. J. (1991), "On the occurrence of carbon dioxide in interstellar grain mantles and ion-molecule chemistry", Monthly Notices of the Royal Astronomical Society 252: 63–67, Bibcode:1991MNRAS.252...63W 
  71. ^ Zack, L. N.; Halfen, D. T.; Ziurys, L. M. (June 2011), "Detection of FeCN (X 4Δi) in IRC+10216: A New Interstellar Molecule", The Astrophysical Journal Letters 733 (2): L36, Bibcode:2011ApJ...733L..36Z, doi:10.1088/2041-8205/733/2/L36 
  72. ^ Lis, D. C. et al. (2010-10-01), "Herschel/HIFI discovery of interstellar chloronium (H2Cl+)", Astronomy & Astrophysics 521: L9, arXiv:1007.1461, Bibcode:2010A&A...521L...9L, doi:10.1051/0004-6361/201014959. 
  73. ^ Europe's space telescope ISO finds water in distant places, ESO, April 29, 1997, archived from the original on 2006-12-22, retrieved 2007-02-08 
  74. ^ Ossenkopf, V. et al. (2010), "Detection of interstellar oxidaniumyl: Abundant H2O+ towards the star-forming regions DR21, Sgr B2, and NGC6334", Astronomy & Astrophysics 518: L111, arXiv:1005.2521, Bibcode:2010A&A...518L.111O, doi:10.1051/0004-6361/201014577. 
  75. ^ Parise, B.; Bergman, P.; Du, F. (2012), "Detection of the hydroperoxyl radical HO2 toward ρ Ophiuchi A. Additional constraints on the water chemical network", Astronomy & Astrophysics Letters 541: L11–L14, arXiv:1205.0361, Bibcode:2012A&A...541L..11P, doi:10.1051/0004-6361/201219379 
  76. ^ Snyder, L. E.; Buhl, D. (1971), "Observations of Radio Emission from Interstellar Hydrogen Cyanide", Astrophysical Journal 163: L47–L52, Bibcode:1971ApJ...163L..47S, doi:10.1086/180664 
  77. ^ a b Schilke, P.; Benford, D. J.; Hunter, T. R.; Lis, D. C., Phillips, T. G.; Phillips, T. G. (2001), "A Line Survey of Orion-KL from 607 to 725 GHZ", Astrophysical Journal Supplement Series 132 (2): 281–364, Bibcode:2001ApJS..132..281S, doi:10.1086/318951 
  78. ^ a b Schenewerk, M. S.; Snyder, L. E.; Hjalmarson, A. (1986), "Interstellar HCO - Detection of the missing 3 millimeter quartet", Astrophysical Journal, Part 2 - Letters to the Editor 303: L71–L74, Bibcode:1986ApJ...303L..71S, doi:10.1086/184655 
  79. ^ a b c d e f Kawaguchi, Kentarou et al. (1994), "Detection of a new molecular ion HC3NH(+) in TMC-1", Astrophysical Journal 420: L95, Bibcode:1994ApJ...420L..95K, doi:10.1086/187171 
  80. ^ Agúndez, M.; Cernicharo, J.; Guélin, M. (2007), "Discovery of Phosphaethyne (HCP) in Space: Phosphorus Chemistry in Circumstellar Envelopes", The Astrophysical Journal 662 (2): L91, Bibcode:2007ApJ...662L..91A, doi:10.1086/519561, retrieved 2007-06-02 
  81. ^ Schilke, P.; Comito, C.; Thorwirth, S. (2003), "First Detection of Vibrationally Excited HNC in Space", The Astrophysical Journal 582 (2): L101–L104, Bibcode:2003ApJ...582L.101S, doi:10.1086/367628, retrieved 2008-09-14 
  82. ^ Hollis, J. M. et al. (1991), Interstellar HNO: Confirming the Identification, "Atoms, ions and molecules: New results in spectral line astrophysics", Atoms (San Francisco: ASP) 16: 407–412, Bibcode:1991ASPC...16..407H 
  83. ^ van Dishoeck, Ewine F. et al. (1993), "Detection of the Interstellar NH 2 Radical", Astrophysical Journal, Part 2 - Letters 416: L83–L86, Bibcode:1993ApJ...416L..83V, doi:10.1086/187076 
  84. ^ Womack, M.; Ziurys, L. M.; Wyckoff, S. (1992), "A survey of N2H(+) in dense clouds - Implications for interstellar nitrogen and ion-molecule chemistry", Astrophysical Journal, Part 1 387: 417–429, Bibcode:1992ApJ...387..417W, doi:10.1086/171094 
  85. ^ Ziurys, L. M. et al. (1994), "Detection of interstellar N2O: A new molecule containing an N-O bond", Astrophysical Journal, Part 2 - Letters 436: L181–L184, Bibcode:1994ApJ...436L.181Z, doi:10.1086/187662 
  86. ^ Hollis, J. M.; Rhodes, P. J. (November 1, 1982), "Detection of interstellar sodium hydroxide in self-absorption toward the galactic center", Astrophysical Journal, Part 2 - Letters to the Editor 262: L1–L5, Bibcode:1982ApJ...262L...1H, doi:10.1086/183900 
  87. ^ Goldsmith, P. F.; Linke, R. A. (1981), "A study of interstellar carbonyl sulfide", Astrophysical Journal, Part 1 245: 482–494, Bibcode:1981ApJ...245..482G, doi:10.1086/158824 
  88. ^ Phillips, T. G.; Knapp, G. R. (1980), "Interstellar Ozone", American Astronomical Society Bulletin 12: 440, Bibcode:1980BAAS...12..440P 
  89. ^ a b c d e f g h i j Johansson, L. E. B. et al. (1984), "Spectral scan of Orion A and IRC+10216 from 72 to 91 GHz", Astronomy and Astrophysics 130 (2): 227–256, Bibcode:1984A&A...130..227J 
  90. ^ Guélin, M. et al. (2004), "Astronomical detection of the free radical SiCN", Astronomy and Astrophysics 363: L9–L12, Bibcode:2000A&A...363L...9G 
  91. ^ Guélin, M. et al. (2004), "Detection of the SiNC radical in IRC+10216", Astronomy and Astrophysics 426 (2): L49–L52, Bibcode:2004A&A...426L..49G, doi:10.1051/0004-6361:200400074 
  92. ^ Snyder, Lewis E. et al. (1999), "Microwave Detection of Interstellar Formaldehyde", Physical Review Letters 61 (2): 77–115, Bibcode:1969PhRvL..22..679S, doi:10.1103/PhysRevLett.22.679 
  93. ^ Feuchtgruber, H. et al. (June 2000), "Detection of Interstellar CH3", The Astrophysical Journal 535 (2): L111–L114, arXiv:astro-ph/0005273, Bibcode:2000ApJ...535L.111F, doi:10.1086/312711, PMID 10835311 
  94. ^ a b Irvine, W. M. et al. (1984), "Confirmation of the Existence of Two New Interstellar Molecules: C3H and C3O", Bulletin of the American Astronomical Society 16: 877, Bibcode:1984BAAS...16..877I 
  95. ^ Pety, J. et al. (2012), "The IRAM-30 m line survey of the Horsehead PDR. II. First detection of the l-C3MH+ hydrocarbon cation", Astronomy & Astrophysica 548: A68, arXiv:1210.8178, Bibcode:2012A&A...548A..68P, doi:10.1051/0004-6361/201220062 
  96. ^ Mangum, J. G.; Wootten, A. (1990), "Observations of the cyclic C3H radical in the interstellar medium", Astronomy and Astrophysics 239: 319–325, Bibcode:1990A&A...239..319M 
  97. ^ Wootten, Alwyn et al. (1991), "Detection of interstellar H3O(+) - A confirming line", Astrophysical Journal, Part 2 - Letters 380: L79–L83, Bibcode:1991ApJ...380L..79W, doi:10.1086/186178 
  98. ^ a b c Betz, A. L. (1981), "Ethylene in IRC +10216", Astrophysical Journal, Part 2 - Letters to the Editor 244: –L105, Bibcode:1981ApJ...244L.103B, doi:10.1086/183490 
  99. ^ Ohishi, Masatoshi et al. (1994), "Detection of a new interstellar molecule, H2CN", Astrophysical Journal, Part 2 - Letters 427: L51–L54, Bibcode:1994ApJ...427L..51O, doi:10.1086/187362 
  100. ^ Aiello, S.; Morbidelli, L.; Ulivi, L. (1981), "Far UV radiation transfer and H2CO lifetime in dense interstellar clouds", Astrophysics and Space Science 80: 173–187, Bibcode:1981Ap&SS..80..173A, doi:10.1007/BF00649145 
  101. ^ Minh, Y. C.; Irvine, W. M.; Brewer, M. K. (1991), "H2CS abundances and ortho-to-para ratios in interstellar clouds", Astronomy and Astrophysics 244: 181–189, Bibcode:1991A&A...244..181M, PMID 11538284 
  102. ^ Guelin, M.; Cernicharo, J. (1991), "Astronomical detection of the HCCN radical - Toward a new family of carbon-chain molecules?", Astronomy and Astrophysics 244: L21–L24, Bibcode:1991A&A...244L..21G 
  103. ^ Minh, Y. C.; Irvine, W. M.; Ziurys, L. M. (1988), "Observations of interstellar HOCO(+) - Abundance enhancements toward the Galactic center", Astrophysical Journal, Part 1 334: 175–181, Bibcode:1988ApJ...334..175M, doi:10.1086/166827 
  104. ^ Marcelino, Núria et al. (2009), "Discovery of fulminic acid, HCNO, in dark clouds", Astrophysical Journal 690: L27–L30, arXiv:0811.2679, Bibcode:2009ApJ...690L..27M, doi:10.1088/0004-637X/690/1/L27 
  105. ^ Brünken, S. et al. (2010-07-22), "Interstellar HOCN in the Galactic center region", Astronomy & Astrophysics 516: A109, arXiv:1005.2489, Bibcode:2010A&A...516A.109B, doi:10.1051/0004-6361/200912456 
  106. ^ Bergman; Parise; Liseau; Larsson; Olofsson; Menten; Güsten (2011), "Detection of interstellar hydrogen peroxide", Astronomy & Astrophysics 531: L8, arXiv:1105.5799, Bibcode:2011A&A...531L...8B, doi:10.1051/0004-6361/201117170. 
  107. ^ a b Frerking, M. A.; Linke, R. A.; Thaddeus, P. (1979), "Interstellar isothiocyanic acid", Astrophysical Journal, Part 2 - Letters to the Editor 234: L143–L145, Bibcode:1979ApJ...234L.143F, doi:10.1086/183126 
  108. ^ a b Nguyen-Q-Rieu; Graham, D.; Bujarrabal, V. (1984), "Ammonia and cyanotriacetylene in the envelopes of CRL 2688 and IRC + 10216", Astronomy and Astrophysics 138 (1): L5–L8, Bibcode:1984A&A...138L...5N 
  109. ^ Halfen, D. T. et al. (September 2009), "Detection of a New Interstellar Molecule: Thiocyanic Acid HSCN", The Astrophysical Journal Letters 702 (2): L124–L127, Bibcode:2009ApJ...702L.124H, doi:10.1088/0004-637X/702/2/L124 
  110. ^ Cabezas, C. et al. (2013), "Laboratory and Astronomical Discovery of Hydromagnesium Isocyanide", Astrophysical Journal 775: 133, arXiv:1309.0371, Bibcode:2013ApJ...775..133C, doi:10.1088/0004-637X/775/2/133 
  111. ^ Butterworth, Anna L. et al. (2004), "Combined element (H and C) stable isotope ratios of methane in carbonaceous chondrites", Monthly Notices of the Royal Astronomical Society 347 (3): 807–812, Bibcode:2004MNRAS.347..807B, doi:10.1111/j.1365-2966.2004.07251.x 
  112. ^ http://www.astro.uni-koeln.de/site/vorhersagen/molecules/ism/Ammonium.html
  113. ^ http://iopscience.iop.org/2041-8205/771/1/L10/
  114. ^ Cernicharo, J.; Marcelino, N.; Roueff, E.; Gerin, M.; Jiménez-Escobar, A.; Muñoz Caro, G. M. (2012), "Discovery of the Methoxy Radical, CH3O, toward B1: Dust Grain and Gas-phase Chemistry in Cold Dark Clouds", The Astrophysical Journal Letters 759 (2): L43–L46, Bibcode:2012ApJ...759L..43C, doi:10.1088/2041-8205/759/2/L43 
  115. ^ a b c d e f g h Finley, Dave (August 7, 2006), Researchers Use NRAO Telescope to Study Formation Of Chemical Precursors to Life, National Radio Astronomy Observatory, retrieved 2006-08-10 
  116. ^ a b c d e f g Fossé, David et al. (2001), "Molecular Carbon Chains and Rings in TMC-1", Astrophysical Journal 552 (1): 168–174, arXiv:astro-ph/0012405, Bibcode:2001ApJ...552..168F, doi:10.1086/320471, retrieved 2008-09-14 
  117. ^ Dickens, J. E. et al. (1997), "Hydrogenation of Interstellar Molecules: A Survey for Methylenimine (CH2NH)", Astrophysical Journal 479 (1 Pt 1): 307–12, Bibcode:1997ApJ...479..307D, doi:10.1086/303884, PMID 11541227 
  118. ^ McGuire, B.A. et al. (2012), "Interstellar Carbodiimide (HNCNH): A New Astronomical Detection from the GBT PRIMOS Survey via Maser Emission Features", The Astrophysical Journal Letters 758 (2): L33–L38, arXiv:1209.1590, Bibcode:2012ApJ...758L..33M, doi:10.1088/2041-8205/758/2/L33 
  119. ^ Ohishi, Masatoshi et al. (1996), "Detection of a New Interstellar Molecular Ion, H2COH+ (Protonated Formaldehyde)", Astrophysical Journal 471 (1): L61–4, Bibcode:1996ApJ...471L..61O, doi:10.1086/310325, PMID 11541244 
  120. ^ Cernicharo, J. et al. (2007), "Astronomical detection of C4H<sup-, the second interstellar anion", Astronomy and Astrophysics 61 (2): L37–L40, Bibcode:2007A&A...467L..37C, doi:10.1051/0004-6361:20077415 
  121. ^ a b Walmsley, C. M.; Winnewisser, G.; Toelle, F. (1990), "Cyanoacetylene and cyanodiacetylene in interstellar clouds", Astronomy and Astrophysics 81 (1–2): 245–250, Bibcode:1980A&A....81..245W 
  122. ^ Kawaguchi, Kentarou et al. (1992), "Detection of isocyanoacetylene HCCNC in TMC-1", Astrophysical Journal 386 (2): L51–L53, Bibcode:1992ApJ...386L..51K, doi:10.1086/186290 
  123. ^ Turner, B. E. et al. (1975), "Microwave detection of interstellar cyanamide", Astrophysical Journal 201: L149–L152, Bibcode:1975ApJ...201L.149T, doi:10.1086/181963 
  124. ^ Remijan, Anthony J. et al. (2008), "Detection of interstellar cyanoformaldehyde (CNCHO)", Astrophysical Journal 675 (2): L85–L88, Bibcode:2008ApJ...675L..85R, doi:10.1086/533529 
  125. ^ Goldhaber, D. M.; Betz, A. L. (1984), "Silane in IRC +10216", Astrophysical Journal, Part 2 - Letters to the Editor 279: –L55–L58, Bibcode:1984ApJ...279L..55G, doi:10.1086/184255 
  126. ^ a b c d Hollis, J. M. et al. (2006), "Detection of Acetamide (CH3CONH2): The Largest Interstellar Molecule with a Peptide Bond", Astrophysical Journal 643 (1): L25–L28, Bibcode:2006ApJ...643L..25H, doi:10.1086/505110 
  127. ^ Zaleski, D. P. et al. (2013), "Detection of E-Cyanomethanimine toward Sagittarius B2(N) in the Green Bank Telescope PRIMOS Survey", Astrophysical Journal Letters 765: L109, arXiv:1302.0909, Bibcode:2013ApJ...765L..10Z, doi:10.1088/2041-8205/765/1/L10 
  128. ^ a b c d e Remijan, Anthony J. et al. (2005), "Interstellar Isomers: The Importance of Bonding Energy Differences", Astrophysical Journal 632 (1): 333–339, arXiv:astro-ph/0506502, Bibcode:2005ApJ...632..333R, doi:10.1086/432908 
  129. ^ a b c Cernicharo, José et al. (1997), "Infrared Space Observatory's Discovery of C4H2, C6H2, and Benzene in CRL 618", Astrophysical Journal Letters 546 (2): L123–L126, Bibcode:2001ApJ...546L.123C, doi:10.1086/318871 
  130. ^ Guelin, M.; Neininger, N.; Cernicharo, J. (1998), "Astronomical detection of the cyanobutadiynyl radical C_5N", Astronomy and Astrophysics 335: L1–L4, arXiv:astro-ph/9805105, Bibcode:1998A&A...335L...1G 
  131. ^ Irvine, W. M. et al. (1988), "A new interstellar polyatomic molecule - Detection of propynal in the cold cloud TMC-1", Astrophysical Journal, Part 2 - Letters 335: L89–L93, Bibcode:1988ApJ...335L..89I, doi:10.1086/185346 
  132. ^ a b Scientists Toast the Discovery of Vinyl Alcohol in Interstellar Space, National Radio Astronomy Observatory, October 1, 2001, retrieved 2006-12-20 
  133. ^ a b Dickens, J. E. et al. (1997), "Detection of Interstellar Ethylene Oxide (c-C2H4O)", The Astrophysical Journal 489 (2): 753–757, Bibcode:1997ApJ...489..753D, doi:10.1086/304821, PMID 11541726 
  134. ^ Kaifu, N.; Takagi, K.; Kojima, T. (1975), "Excitation of interstellar methylamine", Astrophysical Journal 198: L85–L88, Bibcode:1975ApJ...198L..85K, doi:10.1086/181818 
  135. ^ McCarthy, M. C. et al. (2006), "Laboratory and Astronomical Identification of the Negative Molecular Ion C6H-", Astrophysical Journal 652 (2): L141–L144, Bibcode:2006ApJ...652L.141M, doi:10.1086/510238 
  136. ^ a b Mehringer, David M. et al. (1997), "Detection and Confirmation of Interstellar Acetic Acid", Astrophysical Journal Letters 480: L71, Bibcode:1997ApJ...480L..71M, doi:10.1086/310612 
  137. ^ a b Lovas, F. J. et al. (2006), "Hyperfine Structure Identification of Interstellar Cyanoallene toward TMC-1", Astrophysical Journal Letters 637 (1): L37–L40, Bibcode:2006ApJ...637L..37L, doi:10.1086/500431 
  138. ^ a b Sincell, Mark (June 27, 2006), The Sweet Signal of Sugar in Space, American Association for the Advancement of Science, retrieved 2006-12-20 [dead link]
  139. ^ Loomis, R. A. et al. (2013), "The Detection of Interstellar Ethanimine CH3CHNH) from Observations Taken during the GBT PRIMOS Survey", Astrophysical Journal Letters 765: L9, arXiv:1302.1121, Bibcode:2013ApJ...765L...9L, doi:10.1088/2041-8205/765/1/L9 
  140. ^ Guelin, M. et al. (1997), "Detection of a new linear carbon chain radical: C7H", Astronomy and Astrophysics 317: L37–L40, Bibcode:1997A&A...317L...1G 
  141. ^ Belloche, A. et al. (2008), "Detection of amino acetonitrile in Sgr B2(N)", Astronomy & Astrophysics 482: 179–196, arXiv:0801.3219, Bibcode:2008A&A...482..179B, doi:10.1051/0004-6361:20079203 
  142. ^ a b Remijan, Anthony J. et al. (2006), "Methyltriacetylene (CH3C6H) toward TMC-1: The Largest Detected Symmetric Top", Astrophysical Journal 643 (1): L37–L40, Bibcode:2006ApJ...643L..37R, doi:10.1086/504918 
  143. ^ Snyder, L. E. et al. (1974), "Radio Detection of Interstellar Dimethyl Ether", Astrophysical Journal 191: L79–L82, Bibcode:1974ApJ...191L..79S, doi:10.1086/181554 
  144. ^ Zuckerman, B. et al. (1975), "Detection of interstellar trans-ethyl alcohol", Astrophysical Journal 196 (2): L99–L102, Bibcode:1975ApJ...196L..99Z, doi:10.1086/181753 
  145. ^ Cernicharo, J.; Guelin, M. (1996), "Discovery of the C8H radical", Astronomy and Astrophysics 309: L26–L30, Bibcode:1996A&A...309L..27C 
  146. ^ Brünken, S. et al. (2007), "Detection of the Carbon Chain Negative Ion C8H in TMC-1", Astrophysical Journal 664 (1): L43–L46, Bibcode:2007ApJ...664L..43B, doi:10.1086/520703 
  147. ^ a b c d Bell, M. B. et al. (1997), "Detection of HC11N in the Cold Dust Cloud TMC-1", Astrophysical Journal Letters 483 (1): L61–L64, arXiv:astro-ph/9704233, Bibcode:1997ApJ...483L..61B, doi:10.1086/310732 
  148. ^ Kroto, H. W. et al. (1978), "The detection of cyanohexatriyne, H(C≡ C)3CN, in Heiles's cloud 2", The Astrophysical Journal 219: L133–L137, Bibcode:1978ApJ...219L.133K, doi:10.1086/182623 
  149. ^ Marcelino, N. et al. (2007), "Discovery of Interstellar Propylene (CH2CHCH3): Missing Links in Interstellar Gas-Phase Chemistry", Astrophysical Journal 665 (2): L127–L130, arXiv:0707.1308, Bibcode:2007ApJ...665L.127M, doi:10.1086/521398 
  150. ^ Snyder, Lewis E. et al. (2002), "Confirmation of Interstellar Acetone", The Astrophysical Journal 578 (1): 245–255, Bibcode:2002ApJ...578..245S, doi:10.1086/342273 
  151. ^ Hollis, J. M. et al. (2002), "Interstellar Antifreeze: Ethylene Glycol", Astrophysical Journal 571 (1): L59–L62, Bibcode:2002ApJ...571L..59H, doi:10.1086/341148, retrieved 2010-07-18 
  152. ^ Hollis, J. M. (2005), "Complex Molecules and the GBT: Is Isomerism the Key?", Proceedings of the IAU Symposium 231, Astrochemistry throughout the Universe, Asilomar, CA, pp. 119–127 
  153. ^ a b Belloche, A. et al. (May 2009), "Increased complexity in interstellar chemistry: Detection and chemical modeling of ethyl formate and n-propyl cyanide in Sgr B2(N)", Astronomy and Astrophysics 499 (1): 215–232, arXiv:0902.4694, Bibcode:2009A&A...499..215B, doi:10.1051/0004-6361/200811550 
  154. ^ Tercero, B. et al. (2013), "Discovery of Methyl Acetate and Gauche Ethyl Formate in Orion", Astrophysical Journal Letters 770: L13, arXiv:1305.1135, Bibcode:2013ApJ...770L..13T, doi:10.1088/2041-8205/770/1/L13 
  155. ^ a b Cami, Jan et al. (July 22, 2010), "Detection of C60 and C70 in a Young Planetary Nebula", Science 329 (5996): 1180–2, Bibcode:2010Sci...329.1180C, doi:10.1126/science.1192035, PMID 20651118 
  156. ^ Foing, B. H.; Ehrenfreund, P. (1994), "Detection of two interstellar absorption bands coincident with spectral features of C60+", Nature 369 (6478): 296, Bibcode:1994Natur.369..296F, doi:10.1038/369296a0. 
  157. ^ Berné, O.; Mulas, G.; Joblin, C. (2012), "Interstellar C60+", ArXiv 
  158. ^ a b Lacour, S. et al. (2005), "Deuterated molecular hydrogen in the Galactic ISM. New observations along seven translucent sightlines", Astronomy and Astrophysics 430 (3): 967–977, arXiv:astro-ph/0410033, Bibcode:2005A&A...430..967L, doi:10.1051/0004-6361:20041589 
  159. ^ a b c d Ceccarelli, Cecilia (2002), "Millimeter and infrared observations of deuterated molecules", Planetary and Space Science 50 (12–13): 1267–1273, Bibcode:2002P&SS...50.1267C, doi:10.1016/S0032-0633(02)00093-4 
  160. ^ Green, Sheldon (1989), "Collisional excitation of interstellar molecules - Deuterated water, HDO", Astrophysical Journal Supplement Series 70: 813–831, Bibcode:1989ApJS...70..813G, doi:10.1086/191358 
  161. ^ Butner, H. M. et al. (2007), "Discovery of interstellar heavy water", Astrophysical Journal 659 (2): L137–L140, Bibcode:2007ApJ...659L.137B, doi:10.1086/517883 
  162. ^ a b c d Turner, B. E.; Zuckerman, B. (1978), "Observations of strongly deuterated molecules - Implications for interstellar chemistry", Astrophysical Journal, Part 2 - Letters to the Editor 225: L75–L79, Bibcode:1978ApJ...225L..75T, doi:10.1086/182797 
  163. ^ Lis, D. C. et al. (2002), "Detection of Triply Deuterated Ammonia in the Barnard 1 Cloud", Astrophysical Journal 571 (1): L55–L58, Bibcode:2002ApJ...571L..55L, doi:10.1086/341132. 
  164. ^ Hatchell, J. (2003), "High NH2D/NH3 ratios in protostellar cores", Astronomy and Astrophysics 403 (2): L25–L28, arXiv:astro-ph/0302564, Bibcode:2003A&A...403L..25H, doi:10.1051/0004-6361:20030297. 
  165. ^ Turner, B. E. (1990), "Detection of doubly deuterated interstellar formaldehyde (D2CO) - an indicator of active grain surface chemistry", Astrophysical Journal, Part 2 - Letters 362: L29–L33, Bibcode:1990ApJ...362L..29T, doi:10.1086/185840. 
  166. ^ Cernicharo, J. et al. (2013), "Detection of the Ammonium ion in space", Astrophysical Journal Letters 771: L10, arXiv:1306.3364, Bibcode:2013ApJ...771L..10C, doi:10.1088/2041-8205/771/1/L10 
  167. ^ Doménech, J. L. et al. (2013), "Improved Determinination of the 10-00 Rotational Frequency of NH3D+ from the High-Resolution Spectrum of the ν4 Infrared Band", Astrophysical Journal Letters 771: L11, arXiv:1306.3792, Bibcode:2013ApJ...771L..11D, doi:10.1088/2041-8205/771/1/L10 
  168. ^ Gerin, M. et al. (1992), "Interstellar detection of deuterated methyl acetylene", Astronomy and Astrophysics 253 (2): L29–L32, Bibcode:1992A&A...253L..29G. 
  169. ^ Markwick, A. J.; Charnley, S. B.; Butner, H. M.; Millar, T. J. (2005), "Interstellar CH3CCD", The Astrophysical Journal 627 (2): L117–L120, Bibcode:2005ApJ...627L.117M, doi:10.1086/432415. 
  170. ^ Agúndez, M. et al. (2008-06-04), "Tentative detection of phosphine in IRC +10216", Astronomy & Astrophysics 485 (3): L33, arXiv:0805.4297, Bibcode:2008A&A...485L..33A, doi:10.1051/0004-6361:200810193 
  171. ^ Gupta, H. et al. (2013), "Laboratory Measurements and Tentative Astronomical Identification of H2NCO+", Astrophysical Journal Letters 778: L1, Bibcode:2013ApJ...778L...1G, doi:10.1088/2041-8205/778/1/L1 
  172. ^ Kuan, Y. J. et al. (2003), "Interstellar Glycine", Astrophysical Journal 593 (2): 848–867, Bibcode:2003ApJ...593..848K, doi:10.1086/375637. 
  173. ^ Widicus Weaver, S. L.; Blake, G. A. (2005), "1,3-Dihydroxyacetone in Sagittarius B2(N-LMH): The First Interstellar Ketose", Astrophysical Journal Letters 624 (1): L33–L36, Bibcode:2005ApJ...624L..33W, doi:10.1086/430407 
  174. ^ Fuchs, G. W. et al. (2005), "Trans-Ethyl Methyl Ether in Space: A new Look at a Complex Molecule in Selected Hot Core Regions", Astronomy & Astrophysics 444 (2): 521–530, arXiv:astro-ph/0508395, Bibcode:2005A&A...444..521F, doi:10.1051/0004-6361:20053599, retrieved 2010-07-18 
  175. ^ Iglesias-Groth, S. et al. (2008-09-20), "Evidence for the Naphthalene Cation in a Region of the Interstellar Medium with Anomalous Microwave Emission", The Astrophysical Journal Letters 685: L55–L58, arXiv:0809.0778, Bibcode:2008ApJ...685L..55I, doi:10.1086/592349  - This spectral assignment has not been independently confirmed, and is described by the authors as "tentative" (page L58).
  176. ^ García-Hernández, D. A. et al. (2011), "The Formation of Fullerenes: Clues from New C60, C70, and (Possible) Planar C24 Detections in Magellanic Cloud Planetary Nebulae", Astrophysical Journal Letters 737 (2): L30, arXiv:1107.2595, Bibcode:2011ApJ...737L..30G, doi:10.1088/2041-8205/737/2/L30, retrieved 2011-08-12. 
  177. ^ Iglesias-Groth, S. et al. (May 2010), "A search for interstellar anthracene toward the Perseus anomalous microwave emission region", Monthly Notices of the Royal Astronomical Society 407 (4): 2157, arXiv:1005.4388, Bibcode:2010MNRAS.407.2157I, doi:10.1111/j.1365-2966.2010.17075.x 

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