Threshold photoelectron photoion coincidence spectroscopy of trichloroethene and tetrachloroethene

MA Parkes, S Ali, Matthew Simpson, Richard Tuckett, AER Malins

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The threshold photoelectron, the threshold photoelectron photoion coincidence and ion breakdown spectra of trichloroethene and tetrachloroethene have been recorded from 9 – 22 eV. Comparisons with the equivalent data for the three dichloroethene molecules and theoretical calculations highlight the nature of the orbitals involved during photoionisation in this energy range. The ground electronic state of C\(_2\)HCl\(_3^+\) (C\(_2\)Cl\(_4^+\)) is bound, with excited valence states dissociating to C\(_2\)HCl\(_2^+\) (C\(_2\)Cl\(_3^+\)) and C\(_2\)HCl\(^+\) (C\(_2\)Cl\(_2^+\)). Appearance energies suggest that C\(_2\)HCl\(^+\) forms from C\(_2\)HCl\(_3^+\) by loss of two chlorine atoms, whereas C\(_2\)Cl\(_2^+\) forms from C\(_2\)Cl\(_4^+\) by loss of a Cl\(_2\) molecule. The translational kinetic energy release into C\(_2\)HCl\(_2^+\) (C\(_2\)Cl\(_3^+\)) + Cl is determined as a function of energy. In both cases, the fraction of the available energy released into translational energy of the two products decreases as the photon energy increases.
Original languageEnglish
Pages (from-to)1739-1749
Number of pages11
JournalMolecular Physics
Issue number14
Publication statusPublished - 20 Jul 2008


  • tetrachloroethene
  • trichloroethene
  • photoionisation
  • threshold photoelectron
  • coincidence


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