Many-body effect in the M 45–N 23N 45–N 45N 45N 45 coincidence spectroscopy spectra of metallic elements around Cd

Abstract

The quasi-particle approximation for the 4 p4 d state of the metallic elements around Cd breaks down because of very rapid 4 p4 d–4 d 3 super Coster–Kroning (sCK) decay of the 4 p hole in the presence of the spectator 4 d hole. Here the underbar is a hole. As a result, the 4 p4 d multiplet coupling breaks down. We can examine the presence or absence of the 4 p4 d multiplet by Auger-electron sCK-electron coincidence spectroscopy measurement of the 3 d–4 p4 d–4 d 3 Auger-preceded sCK transitions. We collect the sCK-electrons in coincidence with the Auger-electrons of a selected kinetic energy (KE) and vice versa. If the multiplet coupling breaks down and does not exist, the coincidence sCK-electron (or Auger-electron) lines shift as much as the Auger-electron (or sCK-electron) analyzer's selected KE is varied. We can determine not only the three 4 d-hole sCK final-state energy but also the presence or absence of the 4 p4 d multiplet by Auger-electron sCK-electron coincidence spectroscopy. The unique capability of the coincidence measurement by which one can determine the correlation between an Auger-electron and a sCK electron generated, respectively, by creation and annihilation of the same Auger two-hole final state is very useful, even when the quasi-particle approximation of the two-hole state breaks down.