Soft X-ray photoelectron spectroscopy study of Ni2P(0001)

The electronic structure of Ni2P(0001) has been investigated by photoemission spectroscopy (PES) 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 process leading to the two-hole bound final state. The core-level PES study showed that 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 bulk components by ∼1 eV.