Abstract
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 X 2 Π and C 2Σ + states indicates attractive interaction around S and O atoms with He *(2 3S), where the corresponding 3π(S 3p–O 2p) and 8σ(σ CO) 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 CS axis and smaller interaction was found in the collinear direction of the CO axis with well depth of ca. 70 meV around the oxygen atom in the lone pair region by sp 2 hybridization.
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