Photoelectron spectroscopic evidence for Ni3+ species in chemisorption at a Ni(100) surface

Abstract

It has been shown by X-ray photoelectron spectroscopy that Ni³⁺species are present in the chemisorbed overlayer formed at a Ni(100) surface by the interaction of co-adsorbed water and oxygen; the concentration of Ni³⁺ is estimated to be about 6 × 10¹⁴ cm^–2 at 297 K and the species have a characteristic Ni(2p_3/2) binding energy of 856 eV and an associated satellite peak at 862 eV.