Thermal Accommodation Coefficients of Helium on Tungsten and Hydrogen on Hydrogen-Covered Tungsten at 325°, 403°, and 473°K
- 1 September 1966
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 45 (5) , 1532-1538
- https://doi.org/10.1063/1.1727797
Abstract
Measurements have been made of accommodation coefficients of helium and hydrogen from 324° to 473°K on tungsten under conditions designed to minimize amounts of adsorbable impurities from the experimental system. The helium accommodation coefficient values, lying between 0.0194 and 0.0228, compare favorably with measurements at lower temperatures, obtained by Thomas et al., which are probably the best available. The data are also correlated with results of theories on accommodation. Values of hydrogen accommodation coefficients have been associated with the population of atomic hydrogen on the surface estimated from the adsorption studies of Hickmott. To a first approximation, hydrogen accommodation coefficients are found to be independent of coverage at the high coverages of these experiments and inversely proportional to hydrogen temperature.Keywords
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