Penning ionization of vinyl chloride and vinyl iodide by collision with He*(23S) metastable atoms

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Penning ionization of vinyl chloride (CH2=CHCl) and vinyl iodide (CH2=CHI) upon collision with He*(23S) metastable atoms was studied with a collision-energy-resolved technique. Collision energy dependence of the partial ionization cross sections observed by the ionic-state-resolved measurement indicated that the interaction potential between He* and the target molecule was found to be anisotropic. In the studied collision energy range (100-250 meV), an attractive interaction was found for π electron regions around the vinyl group and in-plane and out-of-plane p electron regions around the halogen atom. Electron correlation bands related to simultaneous π-π* and n-π excitation upon ionization were observed at low electron kinetic energies in the Penning ionization electron spectra of CH2=CHCl and CH2=CHI, respectively.

Original languageEnglish
Pages (from-to)145-154
Number of pages10
JournalJournal of Electron Spectroscopy and Related Phenomena
Issue number1-3
Publication statusPublished - 1999


  • Collision energy
  • Electron correlation band
  • Halogen atom
  • Interaction potential
  • Partial ionization cross section
  • Penning ionization electron spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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