Abstract
Oxygen adsorption onto W(110) at room temperature has been characterized by ELS with the help of Auger, LEED and work function data collected from the same system. Some form of reconstruction occurs up to about 20% coverage. Growth of p(2 × 1) structured islands then takes over up to half coverage after which adsorption occurs via a different type of bonding to the surface. The large gas exposures necessary to saturate the surface at room temperature do not cause bulk oxidation and modest heating of the high coverage surface does not cause reconstruction but merely a re-ordering in the oxygen overlayer. The surface complex formed at high coverage and high temperature leading to desorption of tungsten oxides is characterized in ELS by two sharp losses at 6 and 8 eV.
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