Ionization of octafluorocyclopentene, c-C5F8

doi:10.1088/0022-3727/38/7/018

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Journal of Physics D: Applied Physics

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Journal of Physics D: Applied Physics Volume 38 Number 7 Create an alert RSS this journal

C Q Jiao et al 2005 J. Phys. D: Appl. Phys. 38 1076 doi:10.1088/0022-3727/38/7/018

Ionization of octafluorocyclopentene, c-C₅F₈

C Q Jiao¹, C A DeJoseph Jr² and A Garscadden^2,3

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The ion chemistry in octafluorocyclopentene (c-C₅F₈) is examined by Fourier-transform mass spectrometry under single-collision conditions in the 10⁻⁷ Torr pressure range. Absolute total and partial cross-sections of electron impact ionization on c-C₅F₈ are measured as a function of the electron energy in the range 10–200 eV. The molecular ion and 11 fragment ions are observed with a total cross-section of 1.0 × 10⁻¹⁵ cm² at ~70 eV. The ion population at low energies (< 40 eV) is dominated by ${\rm C}_{3}{\rm F}_{3}^{ + }$ , ${\rm C}_{4}{\rm F}_{6}^{ + }$ , ${\rm C}_{5}{\rm F}_{7}^{+}$ , ${\rm C}_{4}{\rm F}_{5}^{ + }$ and ${\rm C}_{5}{\rm F}_{8}^{ + }$ . Ar⁺ charge transfer reaction with c-C₅F₈ produces the same important ions except the parent ion ${\rm C}_{5}{\rm F}_{8}^{ + }$ . All ions from c-C₅F₈ are non-reactive with the parent gas molecule, except CF⁺ and ${\rm CF}_{3}^{ + }$ , which react to form ${\rm C}_{5}{\rm F}_{7}^{ + }$ .