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Scattering of Atoms and Molecules from Tungsten: Effect of Surface Composition and Crystal Orientation

Molecular beam techniques have been used to study the scattering of various gases (He, Ar, ; N 2 , CO, and D 2 ) from W(112) and W(110) crystals. The crystal temperature is varied from 300 to 2400 °K, and the partial pressure of oxygen is varied from an undetectable level to ; 1×10; -7; ; Torr to alter the amount (coverage) of oxygen adsorbed on the surface. The results illustrate the strong dependence of the scattering process on surface composition and crystal orientation. The dependence is particularly strong in the case of He, where diffraction is observed at one extreme and essentially diffuse scattering is observed at the other extreme. The results for CO and ; N 2 appear to be consistent with existing data on their sticking probabilities for W(112) and W(110).; http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Vacuum Science and Technology American Vacuum Society

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