Collision-energy-resolved Penning ionization electron spectroscopy of toluene and chlorotoluenes

Stereodynamics in collisional ionization and anisotropic interactions with He*(23S) atoms
Dynamics and Stereodynamics of Bimolecular Collisions

Abstract.

Stereodynamics in ionization of toluene and o-, p-chlorotoluenes by collision with He*(23S) metastable atoms were investigated by two-dimensional collision-energy/electron-energy-resolved Penning ionization electron spectroscopy. Anisotropic interactions around the molecule were studied by the collision energy dependence of partial ionization cross-sections (CEDPICS) as well as model potential calculations, and shielding effect by the methyl group was observed in CEDPICS for ionization from Cl lone-pair orbitals of o- chlorotoluene. Attractive interaction with He*(23S) around the π orbital region was found to be larger for toluene rather than o-, p- chlorotoluenes. Exterior electron density (EED) calculation of partial ionization cross-sections in Penning ionization and negative CEDPICS for ionization band observed in ca. 4 eV in electron energy indicated that π-2π+1 shake-up state was observed in Penning ionization electron spectroscopy of toluene.

PACS.

34.20.-b Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions 34.20.Gj Intermolecular and atom-molecule potentials and forces 34.50.Lf Chemical reactions, energy disposal, and angular distribution, as studied by atomic and molecular beams 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  • N. Kishimoto
    • 1
  • M. Matsumoto
    • 1
  • E. Matsumura
    • 1
  • K. Ohno
    • 1
  1. 1.Department of ChemistryGraduate School of Science, Tohoku UniversitySendaiJapan

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