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The gas-grain interaction in the interstellar medium - Thermal accommodation and trapping
Burke, J. R.; Hollenbach, D. J.
AA(San Francisco State University, San Francisco, CA), AB(NASA, Ames Research Center, Moffett Field, CA)
Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 223-234. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Accommodation Coefficient, Astronomical Models, Gas-Solid Interactions, Interstellar Gas, Interstellar Matter, Trapping, Cosmic Dust, Gas Temperature, Interstellar Chemistry, Mathematical Models, Molecular Clouds, Trapped Particles
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The paper develops a numerical model for calculating thermal accommodation coefficients alphaT and trapping functions ft for gases incident on solid surfaces. The method is especially designed for astrophysical applications in that it treats economically and with moderate accuracy (+ or - 20%) the dependences of alphaT and ft on finite and different surface and gas temperatures for a large number of gas-surface combinations. In particular, the method is applied to the astrophysical combinations of hydrogen and helium gases incident on graphite, silicon, and ice surfaces. Graphs are presented of the dependence of alphaT and ft on interstellar gas temperatures in the range of 10 to 10,000 K and grain temperatures in the range 10 to 1000 K, assuming the current estimates of the gas-surface physical parameters such as the composition and the Debye temperature of the grain material, the repulsive range of the surface potential, and the gas-grain adsorption energy.

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