Interference effects in the Auger decay of theAr 2p−13dresonances

Abstract

Using two-dimensional photoelectron spectroscopy, relative partial photoionization cross sections of all accessible Auger decay channels have been measured in the vicinity of the $\mathrm{Ar} {2p}^{\ensuremath{-}1}3d$ resonances. Significant asymmetric resonance profiles are observed, which mirror each other in their asymmetric features, giving symmetric Lorentzian profiles for the total photoionization cross section. This indicates that interference between direct photoionization and resonant photoexcitation autoionization needs to be taken into account in order to accurately describe partial photoionization cross sections, despite the absence of asymmetric features in the total cross section.