Adsorption of Oxygen on the (110) Plane of Tungsten
- 15 March 1970
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 52 (6), 3283-3294
- https://doi.org/10.1063/1.1673471
Abstract
The sticking coefficients and desorption kinetics of oxygen on a (110) tungsten crystal have been investigated by a step desorption/reflection technique. Sticking coefficients follow a generalized Kisliuk model, if allowance for reflection on first impact with the surface is made. Unlike CO on (110) W, reflection of O2 is appreciable and appears to have an activation energy of 0.6 kcal, with respect to substrate temperature. Desorption follows first‐order kinetics and has an activation energy of ∼ 92 kcal. The process is complex, however, as shown by the variation in pre‐exponential with surface treatment. A mechanism involving the formation and subsequent decomposition of two distinct surface oxide phases is postulated and shown to fit the experimental results. On the basis of this mechanism the observed activation energy corresponds to the process oxide→mobile adsorbed O, and it is shown that this implies an upper limit of 126 kcal for the heat of adsorption of O atoms on (110) W.Keywords
This publication has 26 references indexed in Scilit:
- Adsorption of the CO on the (110) Plane of TungstenThe Journal of Chemical Physics, 1968
- Thermal rearrangement of tungsten field emitters in the presence of adsorbed oxygenTransactions of the Faraday Society, 1968
- Oxidation of the (112) face of tungstenSurface Science, 1967
- The adsorption of oxygen on the surfaces of (110) and (100) oriented tungsten single crystalsSurface Science, 1966
- Diffraction study of oxygen adsorption on a (110) tungsten faceSurface Science, 1966
- Adsorption of Carbon Monoxide on Tungsten. Abundances, Dipole Moments, and Sticking CoefficientsThe Journal of Chemical Physics, 1966
- Surface structure and diffusionDiscussions of the Faraday Society, 1959
- The application of statistical methods to immobile adsorbed filmsMathematical Proceedings of the Cambridge Philosophical Society, 1939
- Intermolecular forces in two-dimensional systemsPhysica, 1937
- METHODS OF CALCULATING AND AVERAGING RATE CONSTANTSJournal of the American Chemical Society, 1931