Electron impact ionization of CDx (x = 1-4)

V. Tarnovsky, A. Levin, H. Deutsch, K. Becker

Research output: Contribution to journalArticle

Abstract

We report measurements of absolute cross sections for the electron-impact ionization and dissociative ionization of the deuterated methane molecule CD4 and the CDx (x = 1-3) free radicals from threshold to 200 eV using the fast-neutral beam technique. We used the deuterated rather than the protonated target species to facilitate a better separation of the various product ions from a given parent molecule in our apparatus. Good agreement was found between our CD4 results and the most recent measurements in CH4. Our results for CD3 and CD2 agree well with earlier measurements carried out under different experimental conditions. The present results for the CD free radical are the first ionization cross section measurements for this target. A common feature of all four targets studied in this work was a dominant parent ionization cross section with essentially the same absolute value of 1.6-1.7 × 10-16 cm2 at 70 eV. A comparison of the experimentally determined total single ionization cross sections with calculated cross sections using a modified additivity rule showed very good agreement for all four targets.

Original languageEnglish (US)
Pages (from-to)139-152
Number of pages14
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume29
Issue number1
DOIs
StatePublished - Jan 14 1996

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electron impact
ionization cross sections
ionization
free radicals
cross sections
neutral beams
molecules
methane
thresholds
products
ions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy(all)

Cite this

Electron impact ionization of CDx (x = 1-4). / Tarnovsky, V.; Levin, A.; Deutsch, H.; Becker, K.

In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 29, No. 1, 14.01.1996, p. 139-152.

Research output: Contribution to journalArticle

Tarnovsky, V. ; Levin, A. ; Deutsch, H. ; Becker, K. / Electron impact ionization of CDx (x = 1-4). In: Journal of Physics B: Atomic, Molecular and Optical Physics. 1996 ; Vol. 29, No. 1. pp. 139-152.
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