Leed and auger electron spectroscopy study of oxygen adsorption on tungsten (110)

Several aspects of oxygen adsorption on W(110) have been examined. Quantitative oxygen coverage as a function of oxygen exposure was determined in an Auger electron spectroscopy study. In particular coverages down to less than 0.02 monolayer of oxygen were detectable. The initial slope of the coverage against exposure curve provided a value of 0.23[+/-]0.05 for the initial sticking coefficient. Exposure dependence of the elastically back-scattered electrons and the electrons that suffered only a surface plasmon energy loss was found to be approximately the same as for the oxygen coverage. The total electron-impact cross section for the desorption of oxygen from an oxygen-saturated W(110) surface was determined to be ~1. 5x10 [to the power of -20] cm [squared] for 1365-eV electrons.Includes bibliographical references (p. 19-21).Several aspects of oxygen adsorption on W(110) have been examined. Quantitative oxygen coverage as a function of oxygen exposure was determined in an Auger electron spectroscopy study. In particular coverages down to less than 0.02 monolayer of oxygen were detectable. The initial slope of the coverage against exposure curve provided a value of 0.23[+/-]0.05 for the initial sticking coefficient. Exposure dependence of the elastically back-scattered electrons and the electrons that suffered only a surface plasmon energy loss was found to be approximately the same as for the oxygen coverage. The total electron-impact cross section for the desorption of oxygen from an oxygen-saturated W(110) surface was determined to be ~1. 5x10 [to the power of -20] cm [squared] for 1365-eV electrons.Mode of access: Internet