Abstract
Abstract In this paper, we first of all present a rather simple and convenient theoretical equation, based upon the plane-wave approximation, for the differential cross-section for photoionization of a polyatomic molecule. Next, we derive an intensity model specific for X-ray photoelectron spectra of a general molecule containing first-row atoms. Applications of the model to CH4, H2O, N2, CO, CF4, and CH3OH give very satisfactory results compared with experimental ESCA relative intensities. Similarities and differences between our theoretical model and Gelius' semiempirical model are pointed out and discussed.
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