Angle-resolved photoelectron spectroscopy of CS2 and COS measured with synchrotron radiation

Angle-resolved photoelectron spectra of CS2 and COS have been taken as a function of photon energy. From these data the angular asymmetry parameter β has been obtained for the five valence orbitals of CS2 and the three least tightly bound valence orbitals of COS. Monochromatized polarized photons produced from synchrotron radiation have permitted studies from near ionization threshold up to 29 eV. The experimental data were used to evaluate previous theoretical calculations which employ a multiple scattering method. The agreement for the least tightly bound orbitals of the nonpolar CS2 molecule were good. There were some problem areas, particularly with the more tightly bound orbitals of CS2 and the polar molecule COS. However, when previous results for CO2 are taken together with the results on CS2 and COS, the calculations in general give a reasonable account of the experimental β values and suggest that the multiple-scattering method will be useful for the study of differential cross sections of polyatomic molecules