Calculation of the differential photoionization cross section of HF

Cross sections, photoelectron angular distribution parameters and branching ratios for the ionization of the valence 1 pi, 3 sigma and inner-valence 2 sigma shells of hydrogen fluoride have been calculated in the Random Phase Approximation (RPA). The computational procedure is based on the K-matrix technique and projection on basis sets of L(2) functions to solve the RPA equations for the three coupled ionization channels in a way that recovers the electronic continuum degeneracy.