Accession Number : AD0777304

Title :   Quantum Theory of Gas-Surface Interactions.

Descriptive Note : Final scientific rept. 30 Jun 72-30 Jun 73,


Personal Author(s) : Drauglis,Edmund J. ; Kaplan,Jerome I.

Report Date : AUG 1973

Pagination or Media Count : 9

Abstract : The purpose of this research program is to develop a better understanding of how gases at thermal energies interact with metallic surfaces. Such an understanding should not only help to explain a large body of data obtained in experimental investigations on the fundamental properties of surfaces but may also provide a useful computational tool for practical applications such as the computations of drag coefficients and heat exchange parameters of high-altitude, high-speed aircraft. A formalism was developed to permit calculations of energy and momentum exchange probabilities for gases impinging on bare metallic surfaces. A mixed classical and quantum-mechanical approach was used and the basic technique involved the application of two-step time-dependent perturbation theory. The calculation resulted in an expression for the probability of energy transfer which included all multiphonon events.

Descriptors :   *Surface chemistry, Inelastic scattering, Atoms, Tungsten, Helium, Scattering, Surfaces, Energy transfer, Quantum theory, Computations

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE