Collision-energy-resolved Penning ionization electron spectroscopy of OCS with He*(23S) metastable atoms

Naoki Kishimoto, Takuya Horio, Satoshi Maeda, Koichi Ohno

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15 Citations (Scopus)


Collision-energy dependence of partial Penning ionization cross-sections (CEDPICS) of OCS was obtained from collision-energy/electron-energy-resolved two-dimensional spectrum with a highly sensitive electron energy analyzer. The negative CEDPICS for X2Π and C2Σ+ states indicates attractive interaction around S and O atoms with He *(23S), where the corresponding 3π(S 3p-O2p) and 8σ(σCO) orbitals extend, respectively. Utilizing classical trajectory calculations for CEDPICS and optimization of model potential energy surface, a large ring-like attractive well with a depth of ca. 120 meV was found for perpendicular directions around C S axis and smaller interaction was found in the collinear direction of the C O axis with well depth of ca. 70 meV around the oxygen atom in the lone pair region by sp2 hybridization.

Original languageEnglish
Pages (from-to)332-339
Number of pages8
JournalChemical Physics Letters
Issue number3-4
Publication statusPublished - Sept 26 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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