Valence and core-level photoelectron spectroscopy study of the electronic structure of Ni2P (0001)

Abstract

The electronic structure of Ni2P(0001) has been investigated by photoelectron spectroscopy utilizing synchrotron radiation. In the valence band spectra, a Ni 3d-P 3p hybrid band (main band) and a satellite were observed at 0-4 eV and at 8 eV, respectively. The satellite showed a, resonant behavior around the Ni 3p threshold, and is associated with the photoemission leading to the two-hole bound final state. From the analysis of the anti-resonance dip of the main band intensity, the Ni 3d component was proved to be included in the whole binding energy region of the main band. In the P 2p core-level spectra, the surface-shifted 2p levels were resolved from the bulk 2p levels, while the surface-shifted peaks were not found in Ni 3p spectra. The binding energies of the surface-shifted P 2p levels were lower than those of the bulk components by ∼1 eV. The surface-shifted levels were attributed to the 2p levels of the surface P atoms which take on a six-fold coordination. © 2009 The Surface Science Society of Japan.