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

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