A PHOTOELECTRON STUDY OF THE INNER VALENCE MOLECULAR-ORBITALS OF OCS

Photoelectron spectra are reported for the inner and outer valence orbitals of carbonyl sulphide for several photon energies up to 110 eV. Photoionization of the inner valence 6σ and 7σ molecular orbitals results in the observation of a complicated structure extending to a binding energy of approximately 40 eV. In the inner valence energy region electron correlation leads to an extensive redistribution of intensity associated with single-hole configurations into multiple electron transition states. Some of the features can be interpreted with the aid of theoretical predictions. The experimental data are compared with a spectrum recorded using X-ray excitation, and a strong energy dependence is observed for one of the peaks. © 1990.