Calculated and measured angular correlation between photoelectrons and Auger electrons from K-shell ionization

We have applied a recently developed computational method to an experimental puzzle that involves a slow outgoing electron that is scattered by a high-energy Auger electron. Although the experiment seemed to be in a regime accurately described by classical mechanics, such classical calculations could not accurately model the angular distribution of the electron pair. Using the wavefunction from our calculations to generate the energy and angular distributions of the two electrons, we have compared our results to measurements performed at the Advanced Light Source. We have obtained good agreement between the experiment and our quantum results, attributing the poor classical result to the small number of angular momenta in the wavefunction. We have included predictions on how measurements depend on the Auger energy and/or the photoelectron energy.