The dependence of accommodation coefficient on surface temperature |
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Authors: | Leon Trilling |
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Institution: | Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A. |
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Abstract: | The dependence of energy accommodation coefficients of inert gases on clean metal surfaces is analyzed in the framework of classical lattice theory. It is found that a Knudsen layer must exist next to the surface to adjust the gas molecular velocity distrivution to surface conditions. At energies below the well-depth, the accommodation coefficient slope is inversely proportional to the square root of the temperature; at energies above the welldepth, the accommodation coefficient is independent of surface temperature. |
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