Interference effects in the Auger decay of the Ar 2p(-1)3d resonances - art. no. 022505

Using two-dimensional photoelectron spectroscopy, relative partial photoion ization cross sections of all accessible Auger decay channels have been mea sured in the vicinity of the Ar 2p(-1)3d resonances. Significant asymmetric resonance profiles are observed, which mirror each other in their asymmetr ic features, giving symmetric Lorentzian profiles for the total photoioniza tion cross section. This indicates that interference between direct photoio nization and resonant photoexcitation autoionization needs to be taken into account in order to accurately describe partial photoionization cross sect ions, despite the absence of asymmetric features in the total cross section .