The gas-grain interaction in the interstellar medium - Thermal accommodation and trapping

摘要: A numerical model is developed for calculating thermal accommodation coefficients ..cap alpha../sub T/ and trapping fractions f/sub t/ gases incident upon solid surfaces. The method especially designed astrophysical applications in that it treats economically with moderate accuracy ( +- 20%) the dependences of on finite different surface gas temperatures a large number gas-surface combinations. Graphs are presented dependence interstellar range 10 K< or =T/sub g/< =10/sup 4/ K grain s/< 3/ K, assuming current estimates physical parameters such as composition Debye temperature material, repulsive potential, gas-grain adsorption energy. graphically, so can readily be calculated knowledge these improves.