Abstract
VO x ultrathin epitaxial films (0.8⩽ x⩽1.3) have been grown on Pt(1 1 1) by evaporating vanadium in a low and well-controlled water background (1×10 −7 Pa). X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy and X-ray excited auger electron spectroscopy data strongly indicate that vanadium(II) in the predominant oxidation state. Angle-scanned photoelectron diffraction data are compatible with a single domain film, bearing a rock-salt VO structure and exposing the (1 1 1) plane. Such films evolve toward more oxidized species within hours, probably due to oxidation by residual water in the chamber.
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