Interference Effects between Auger and Photoelectron Studied by Subnatural Linewidth Auger-Photoelectron Coincidence Spectroscopy

Abstract

Using subnatural linewidth Auger-photoelectron coincidence spectroscopy following linearly polarized synchrotron radiation excitation we have measured the triply differential double photoionization cross section of xenon at a photon energy of 97.5 eV. At this photon energy the kinetic energy of the 4 ${d}_{5/2}$ photoelectron line matches exactly the position of the ${}^{1}{S}_{0}$ ${N}_{5}{O}_{2,3}{O}_{2,3}$ Auger line and therefore the two electrons are indistinguishable. If the two electrons are emitted back to back in the plane of polarization the triply differential cross section fully vanishes.