Two-dimensional Penning ionization electron spectroscopic study on outer characteristics of molecules

Koichi Ohno, Masakazu Yamazaki, Satoshi Maeda, Naoki Kishimoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Collision-energy/electron-energy-resolved two-dimensional Penning ionization electron spectroscopy (2D-PIES) has been used to study outer characteristics of molecules. Anisotropic potential energy surfaces for collisional ionization of molecules with a metastable helium atom He*(23S) have been determined starting from ab initio model potentials via optimization based on trajectory calculations. Since ionization widths in the theoretical model of Penning ionization are functionals of target molecular orbitals, outer electron distributions of molecular orbitals can be determined via optimization procedures of calculated ionization cross-sections by trajectory calculations with respect to observed 2D-PIES data.

Original languageEnglish
Pages (from-to)283-293
Number of pages11
JournalJournal of Electron Spectroscopy and Related Phenomena
Issue number3 SPEC. ISS.
Publication statusPublished - 2005 Mar


  • Ionization cross-section
  • Molecular orbital
  • Penning ionization
  • Potential energy surface
  • Rare gas
  • Trajectory calculation


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