Interference effects between auger and photoelectron studied by subnatural linewidth auger-photoelectron coincidence spectroscopy

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 4d(5/2) photoelectron line matches exactly the position of the S-1(0) N5O2.3O2.3 Auger line and therefore the two electrons are indistinguishable. Lf the two electrons are emitted back to back in the plane of polarization the triply differential cross section fully vanishes.