Fragment ion-photon coincidence (FIPCO) measurements by electron impact on ethylene and the Monte Carlo simulation of the band shape

Kenji Furuya, Eri Koto, Takeshi Ueda, Kouichiro Maruyama, Akihiro Matsuo, Teiichiro Ogawa

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5 Citations (Scopus)

Abstract

Fragment ion-photon coincidence (FIPCO) spectra by controlled electron impact on ethylene have been observed. Several typical band shapes to be observed in the FIPCO spectra have been simulated by Monte Carlo calculations and interpreted on the basis of the lifetimes of light emission and dissociation and of the sequence of emission and dissociation. The correlations between the CH(A-X) emission and the H+, CH+ and CH2+ ions are observed and verified by the Monte Carlo simulation of the observed band shapes. The average translational energy is estimated to be 0.09 eV for H+, 0.35 eV for CH+ and 0.04 eV for CH2+. The branching ratios of their ions are also estimated to be 6.6:89.7:3.7 for H+:CH+:CH2+. On the basis of dissociation limits, the threshold energies in the CH(A-X) excitation function and the translational energies of their ions, it is concluded that the H+ and CH2+ ions are produced through sequential dissociations into CH(A)+CH2(X)+H+ and into CH(A)+CH2+(X)+H (n = 1) and that the CH+ ion is produced through direct dissociation into CH(A)+CH+(X)+H2(X).

Original languageEnglish
Pages (from-to)3167-3182
Number of pages16
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume32
Issue number13
DOIs
Publication statusPublished - Jul 14 1999

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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