Interference of electron pairs in photoinduced N_4,5 - O ₁O_2,3 Auger decay in xenon

We observed an interference originating from coincidence detection of two indistinguishable electron pairs emitted upon photoionization of 4d electron in Xe. At 89.9 eV photon impact the energy of photoelectron ejected from 4d _5/2 orbital equals energy of Auger electron emitted in decay of 4d_3/2 hole into the [5s5p¹P] state, and for the same final state the energy of the 4d_3/2 photoelectron equals the Auger electron energy in decay of 4d_5/2 hole. An angle-integrated coincidence yield as a function of photon energy is measured with the magnetic bottle time-of-flight spectrometer and shows a peak at the expected energy position.