A Model for Gas-Surface Distribution Functions.
GRUMMAN AEROSPACE CORP BETHPAGE N Y RESEARCH DEPT
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A technique to incorporate the results of complete gas-surface trajectory computations into rational mathematical expressions for the exiting gas distribution functions is outlined. These expressions are of the generalized Gaussian, or ellipsoidal, type proposed by Holway. The authors show in specific examples how the undetermined parameters of such models can be determined from various higher moments that are accessible only through complete sets of trajectory computations. Even in these early attempts the resulting distribution function models give reasonable representations of the flux distributions computed from the trajectory calculations and also measured in corresponding laboratory experiments.
- Physical Chemistry