Angle-resolved photoionization of molecules

Abstract This tutorial summarizes the essential theoretical background, underlying the angle-resolved photoelectron spectroscopy of molecules. It reports an analytic derivation of the differential cross section for the one-photon ionization of molecules, as well as further analysis and exemplification of the photoelectron angular distributions in the molecular and laboratory frames of reference. Aiming primarily at nonspecialists, it addresses theoreticians and experimentalists in this rapidly-advancing field of research and provides a brief list of theoretical methodologies for numerical calculations in molecules.