Hydrogen deuteride
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| Hydrogen deuteride | |
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Hydrogen deuteride |
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(2H)Dihydrogen[citation needed] |
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| Identifiers | |
| CAS number | 13983-20-5  |
| PubChem | 167583 |
| ChemSpider | 146609 |
| EC number | 237-773-0 |
| UN number | 1049 |
| ChEBI | CHEBI:29237 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | H[2H] |
| Molar mass | 3.02204 g mol-1 |
| Exact mass | 3.021926810 g mol-1 |
| Melting point |
-259 °C, 14 K, -434 °F |
| Boiling point |
-253 °C, 20 K, -423 °F |
| Hazards | |
| EU classification |  F+ |
| R-phrases | R12 |
| S-phrases | S16, S33, S36, S38 |
| NFPA 704 |
 4
0
0
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| Autoignition temperature |
571 °C |
| Related compounds | |
| Related hydrogens | Deuterium |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Hydrogen deuteride is a diatomic molecule composed of the two isotopes of hydrogen: the majority isotope 1H protium and 2H deuterium. Its molecular formula is HD.
[edit] Availability in nature
Hydrogen deuteride is a minor component of naturally occurring molecular hydrogen. However, Hydrogen deuteride does not chemically behave exactly the same has H2—and can thus serve as an important marker.
In particular Hydrogen deuteride is one of the minor but noticeable components of the atmospheres of all the giant planets, with abundances from about 30 ppm to about 200 ppm. HD has also been found in Supernova remnants, and other sources.
Gas Giants occourance (HD vs H2)
- Jupiter : ~0.003% :: 89.8% ±2.0%
- Uranus : ~0.007% :: 83.0% ±3.0%
- Neptune : ~0.019% :: 80.0% ±3.2%
[edit] Radio emission spectra
HD and H2 do have very similar emission spectra, but don't emit on exactly the same frequencies [1].
The frequency of the astronomically important J = 1-0 rotational transition of HD at 2.7 THz has been measured with tunable FIR radiation with an accuracy of 150 kHz [2].
[edit] References
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