Electron impact ionization of the SF5 and SF3 free radicals

V. Tarnovsky, H. Deutsch, K. E. Martus, K. Becker

Research output: Contribution to journalArticle

Abstract

We measured absolute cross sections for the electron-impact ionization and dissociative ionization of the SF5 and SF3 free radicals from threshold to 200 eV using the fast-neutral-beam technique. The total single ionization cross sections at 70 eV were found to be 5.1×10-16cm2 (SF5) and 3.2×10-16cm2 (SF3). The cross sections reach their maximum at about 100 eV for both radicals, with values of 5.4×10-16cm2 (SF5) and 3.5×10-16cm2 (SF3). Dissociative ionization is important only for SF5, where the SF5 + parent ionization cross section and the SF4 + fragment ionization cross sections have roughly the same value. By contrast, the ionization of SF3 is dominated by the formation of SF3 + parent ions. A comparison of the measured total single ionization cross sections with calculated cross sections, using a modified additivity rule, shows excellent agreement for both radicals in terms of the absolute cross section values and the cross section shapes. Total single ionization cross sections were also calculated for SF4, SF2, and SF.

Original languageEnglish (US)
Pages (from-to)6596-6600
Number of pages5
JournalJournal of Chemical Physics
Volume109
Issue number16
DOIs
StatePublished - 1998

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Impact ionization
ionization cross sections
free radicals
electron impact
Free Radicals
Ionization
ionization
Electrons
cross sections
neutral beams
fragments
thresholds
Ions
ions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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Electron impact ionization of the SF5 and SF3 free radicals. / Tarnovsky, V.; Deutsch, H.; Martus, K. E.; Becker, K.

In: Journal of Chemical Physics, Vol. 109, No. 16, 1998, p. 6596-6600.

Research output: Contribution to journalArticle

Tarnovsky, V. ; Deutsch, H. ; Martus, K. E. ; Becker, K. / Electron impact ionization of the SF5 and SF3 free radicals. In: Journal of Chemical Physics. 1998 ; Vol. 109, No. 16. pp. 6596-6600.
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N2 - We measured absolute cross sections for the electron-impact ionization and dissociative ionization of the SF5 and SF3 free radicals from threshold to 200 eV using the fast-neutral-beam technique. The total single ionization cross sections at 70 eV were found to be 5.1×10-16cm2 (SF5) and 3.2×10-16cm2 (SF3). The cross sections reach their maximum at about 100 eV for both radicals, with values of 5.4×10-16cm2 (SF5) and 3.5×10-16cm2 (SF3). Dissociative ionization is important only for SF5, where the SF5 + parent ionization cross section and the SF4 + fragment ionization cross sections have roughly the same value. By contrast, the ionization of SF3 is dominated by the formation of SF3 + parent ions. A comparison of the measured total single ionization cross sections with calculated cross sections, using a modified additivity rule, shows excellent agreement for both radicals in terms of the absolute cross section values and the cross section shapes. Total single ionization cross sections were also calculated for SF4, SF2, and SF.

AB - We measured absolute cross sections for the electron-impact ionization and dissociative ionization of the SF5 and SF3 free radicals from threshold to 200 eV using the fast-neutral-beam technique. The total single ionization cross sections at 70 eV were found to be 5.1×10-16cm2 (SF5) and 3.2×10-16cm2 (SF3). The cross sections reach their maximum at about 100 eV for both radicals, with values of 5.4×10-16cm2 (SF5) and 3.5×10-16cm2 (SF3). Dissociative ionization is important only for SF5, where the SF5 + parent ionization cross section and the SF4 + fragment ionization cross sections have roughly the same value. By contrast, the ionization of SF3 is dominated by the formation of SF3 + parent ions. A comparison of the measured total single ionization cross sections with calculated cross sections, using a modified additivity rule, shows excellent agreement for both radicals in terms of the absolute cross section values and the cross section shapes. Total single ionization cross sections were also calculated for SF4, SF2, and SF.

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