FIXED-MOLECULE 1S-SIGMA(G,U) PHOTOELECTRON ANGULAR-DISTRIBUTIONS AS APROBE OF SIGMA(G)ASTERISK AND SIGMA(U)ASTERISK SHAPE RESONANCES OF CO2

Angular distributions of 1s sigma(g,u), photoelectrons from CO2 molecu les, oriented parallel to the electric vector of incident light, have been measured. The angular distribution patters at sigma(g) and sigma (u) shape resonances are significantly different. From those expected in the virtual molecular orbitals concept. The analyses of the patter ns have made it clear that the mixing of outgoing photoelectron partia l waves and the interference between them are responsible for the obse rved patterns, unlike N-2 photoionization. Calculations based on a qua siatomic model bare reproduced the observed patterns fairly well.