Prolate trochoidal mass spectrometer

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A prolate trochoidal mass spectrometer is a chemical analysis instrument in which the ions of different mass-to-charge ratio are separated by means of mutually perpendicular electric and magnetic fields so that the ions follow a prolate trochoidal path.[1][2] These devices are sometimes called cycloidal mass spectrometers, although the path is not a cycloid (the prolate trochoid path has loops, the cycloid has cusps).


The instruments are used for the analysis of gases[3] and in gas chromatography-mass spectrometry.[4] The trochoidal configuration can also be used as the basis of an electron monochromator.[5]


  1. ^ Bleakney, Walker; John A. Hipple Jr. (1938). "A New Mass Spectrometer with Improved Focusing Properties". Phys. Rev. 53 (7): 521–529. Bibcode:1938PhRv...53..521B. doi:10.1103/PhysRev.53.521. Retrieved 2007-10-02.
  2. ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version:  (2006–) "Prolate trochoidal mass spectrometer". doi:10.1351/goldbook.P04874
  3. ^ Adamczyk B, Bederski K, Wójcik L (1988). "Mass spectrometric investigation of dissociative ionization of toxic gases by electrons at 20-1000 eV". Biomed. Environ. Mass Spectrom. 16 (1–12): 415–7. doi:10.1002/bms.1200160181. PMID 3149538.
  4. ^ Laramée JA, Deinzer ML (1994). "Capillary gas chromatographic introduction of environmental compounds into a trochoidal electron monochromator/mass spectrometer". Anal. Chem. 66 (5): 719–24. doi:10.1021/ac00077a022. PMID 8154592.
  5. ^ Voinov VG, Vasil'ev YV, Morré J, Barofsky DF, Deinzer ML, Gonin M, Egan TF, Führer K (2003). "A resonant electron capture time-of-flight MS with trochoidal electron monochromator". Anal. Chem. 75 (13): 3001–9. doi:10.1021/ac030019v. PMID 12964744.

External links[edit]

  • US 6624410  Cycloidal mass spectrometer
  • US 6617576  Cycloidal mass spectrometer with time of flight characteristics and associated method