Resonant photoemission at the Ni 2pcore level as a probe of electron correlation effects in nickel

Abstract

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Angular-dependent resonant-photoemission processes at the2pthresholds in nickel metal

“…In resonant photoemission there is an interplay between these Auger-like ͑autoionization͒ processes and the direct photoemission. 5,11 One of the problems is to normalize the spectra at different photon energies and different angles to each other. The following procedure was adopted: Auger spectra where the L 3 and L 2 peaks appeared simultaneously were measured well above the thresholds at different angles.…”

“…[3][4][5][6][7][8] One way to find out if there are any signatures of interference terms between the direct photoemission and the core-hole assisted process is to measure the energy dependence of the photoemission cross section. A strong intensity enhancement of the well-known 6-eV satellite in Ni metal leads to a Fano profile 9 of the photoemission cross section, which has been observed both at the 3 p and 2p core-level thresholds.…”

Resonant Photoemission at the2pEdges of Ni: Resonant Raman and Interference Effects

“…The photoemission spectrum of Ni has been treated within the Hubbard model [10,11] or in terms of configuration interaction states built from atomic configurations [12]. To explain the fact that similar resonances were observed also in Cu, which has a formally filled d band, an alternative mechanism was proposed [11] in which the resonance is maintained by the many-body properties of the core-excited states close to threshold.…”

Resonant Auger spectroscopy at theL2,3shake-up thresholds as a probe of electron correlation effects in nickel

“…In resonant photoemission there is an interplay between direct photoemission and Auger-like ͑autoionization͒ processes. 10,18 When the measurements are performed at sufficiently high resolution, it is in many cases possible to distinguish between Augerlike and photoemissionlike processes in the nonradiative decay spectra. 18 Here the core-level binding energy defines the onset of the regular Auger processes.…”

“…Ni has received much attention, especially in connection with the well-known 6-eV photoemission satellite of both the valence-band and core levels. [8][9][10][11] The strong satellite structures and the small bandwidth in the Ni metal are directly connected to and give important information about the correlation effects, which have been described in terms of a complex, energy-dependent self-energy. [12][13][14][15][16] The 6-eV satellite in valence-band spectra has been observed to display Fano-like intensity variations at both the 3p and 2 p core-level thresholds due to interference effects.…”