DIFFERENTIAL PHOTOIONIZATION CROSS-SECTION CALCULATIONS FOR H2S USING THE RANDOM-PHASE-APPROXIMATION WITH L(2) BASIS FUNCTIONS

The photoionization cross sections and asymmetry parameters of the four main valence ionization processes in H2S, corresponding to the formation of respectively 2b1, 5a1, 2b2 and 4a1 holes, have been calculated in the random phase approximation (RPA). By resorting to a recently proposed computational procedure, based on the K-matrix technique, the RPA equations for the four coupled ionization channels have been projected on a basis set of L2 functions and solved, at any excitation energy above the ionization threshold, in a way that allows to recover the electronic continuum degeneracy.