The Accommodation Coefficient of Helium on Platinum
- 1 March 1944
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 65 (5-6), 185-189
- https://doi.org/10.1103/physrev.65.185
Abstract
The accommodation coefficient of helium on platinum has been measured at 77, 193, 273, and 373°K; and the values obtained at these temperatures for a clean platinum surface are 0.090, 0.043, 0.071, and 0.072 (±0.004), respectively. When the platinum is allowed to remain in contact with the helium for twenty-four hours or more, the accommodation coefficient values increase to 0.43, 0.071, 0.170, and 0.170 (in the same temperature order). Little adsorption occurs at 193°K, but strong van der Waals adsorption appears at 77°K and activated adsorption at the higher temperatures.Keywords
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