Absolute cross sections for the electron impact ionization of the NF 2 and NF free radicals

V. Tarnovsky, A. Levin, K. Becker

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Abstract

We report measurements of the absolute cross sections for the electron-impact ionization of the NF2 and NF free radicals from threshold to 200 eV. At 70 eV, the absolute parent NF2 and NF ionization cross section are 1.25±0.23 Å2 and 1.05±0.19 Å2, respectively. We found little evidence of the presence of vibrationally excited radicals in the incident target beam for both NF2 and NF. We also studied the dissociative ionization of NF2 and NF. The absolute cross section for the formation of the NF+ fragment ions from NF2 was found to be 0.75±0.15 Å2 at 70 eV. The NF+ fragment ions are formed with little excess kinetic energy. The only significant pathway leading to the observed NF+ fragment ions is the single positive ion formation. Our data show no indication of the presence of double positive ion formation channels or positive-negative ion pair formation processes. Cross sections for the formation of the atomic fragment ions F+ and N + from both NF2 as well as NF were found to be small with maximum values of less than 0.1 Å2 at 70 eV in all cases.

Original languageEnglish (US)
Pages (from-to)5626-5630
Number of pages5
JournalThe Journal of Chemical Physics
Volume100
Issue number8
DOIs
StatePublished - Jan 1 1994

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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