K-shell photoionization of CO: II. Determination of dipole matrix elements and phase differences

Using the experimental angular distributions of photoelectrons from the K-shells of an oriented CO molecule reported in a companion paper, we have performed a so-called complete experiment and determined 18 dynamical parameters (ten moduli of transition moments and eight phase differences) for the O K-shell, and 16 dynamical parameters (nine moduli of transition moments and seven phase differences) for the C K shell, and compared them with the results of our calculations in the relaxed-core Hartree-Fock (RCHF) approximation. The agreement between theory and experiment is only qualitative, therefore the model has to be improved by including electron correlations. From the analysis of experimental data we proved that the sigma* shape resonance is due to not only the f-wave, as was widely believed earlier, but is due to approximately equal contributions of three partial waves with 1 less than or equal to l less than or equal to 3 for the C R-shell, and four partial waves with 0 less than or equal to l less than or equal to 3 for the O K-shell, with a rather substantial contribution of other partial waves with I less than or equal to 5. From the analysis of the transition moments determined from the experiment it follows that several Cooper minima are likely to exist in partial photoionization cross sections, in particular, in the C 1s sigma --> epsilons sigma and in the O 1s sigma --> epsilond sigma transitions.