Photoelectron scattering effects in molecular photoionization

An angle-resolved photoelectron-photoion coincidence experiment has been pe rformed on CO at a photon energy of 321 eV. Complete, three-dimensional fra gment ion angular distributions for several C(1s) photoelectron emission di rections have been measured. For the case of photoelectron emission along t he light polarization vector, the ionic fragment angular distribution has b een compared to model calculations to gain information about the relative p hase shift between sigma-->sigma and sigma-pi transition matrix elements. ( C) 1999 Elsevier Science B.V. All rights reserved.