The characterization of some vanadium (100) surface using LEED and AES

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Abstract
Low energy electron diffraction (LEED) supplemented by Auger electron spectroscopy (AES) was used to investigate the properties of the (100) crystallographic face of vanadium metal. A (1×1) surface structure is characteristics of the clean metal surface. Sulfur segregates to the surface upon heating, forming first a C(2×2) structure and then a (√2×2√5) R27° structure. A kinematical analysis of the diffracted beam intensity vs voltage curves proved appropriate for the V(100)−(1×1) structure and yields a value of −9.9 V for the inner potential and a value of 3.02 Å for the surface lattice constant. Room temperature gas adsorption studies on the V(100)−(1×1) surface indicate that oxygen diffuses into the lattice and produces a disordered surface, while carbon monoxide either does not absorb or is desorbed under the influence of the electron beam.