Recent advances in molecular photoionization studies have allowed for the complete experimental determination of all relevant experimental observables in selected cases. The quantitative understanding of this data presents significant challenges for the theoretician. We will examine recent nearly complete experiments that use coincidence measurements that detect both the photoelectron and the ionic photofragment from a given photoionization event to determine the molecular frame photoelectron angular distributions (MFPAD). In favorable cases, from the MFPAD one can obtain the underlying photoionization matrix elements. We will consider the level of agreement between theory and experiment obtained with current computational methods for valence ionization in NO. We will show that an extensive treatment of correlation is needed in order to obtain good agreement between theory and experiment.
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