Photoelectron angular distributions for 2p ionization of atomic oxygen

The photoelectron angular distribution asymmetry parameters beta (i) for th e 2s(2)2p(3) 4S(o), D-2(o) and P-2(o) final ionic states in the photoioniza tion of ground state atomic oxygen are calculated using the R-matrix method in the photon energy range from threshold to 50 eV. Fairly extensive confi guration-interaction wavefunctions are used to describe the initial 2s(2)2p (4) P-3 bound state and the final S-3(o), (3)p(o) and D-3(o) continuum stat es. The prominent features in the asymmetry parameters are the autoionizati on structures. Our results are compared with other available calculations a nd experiments.