Abstract
Abstract Photoemissions at 200—650 nm resulting from the He(23S) Penning ionization of CO2, CS2, OCS, N2O, C6F6, and C6F5H have been studied in the collision energy range of 120—210 meV using a crossed-beam method. The emission cross sections obtained for the excited parent ions were compared with the values measured at thermal energy. The band strengths for the vibrational bands of the OCS+() system are rather different from the values measured by the photoionization of OCS. The dependences of the emission cross sections for triatomic ions on the collision energy have been compared with those of the partial cross sections for the ion states obtained by Penning ionization electron spectroscopy, and the interaction potentials between He(23S) and the triatomic molecules correlating with the Penning ionization are discussed.
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