Accession Number : AD0664679

Title :   CLASSICAL THEORY FOR THE INTERACTION OF GAS ATOMS WITH SOLID SURFACES,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE FLUID MECHANICS LAB

Personal Author(s) : Logan,Roderick M. ; Keck,James C.

Report Date : OCT 1967

Pagination or Media Count : 81

Abstract : A classical theory for the interaction of gas atoms with solid surfaces is presented. The principal assumptions of the model used are: (1) The surface atoms involved in the collisions can be represented as independent one-dimensional oscillators; (2) the gas atoms interact with the surface through a stationary square-well attractive potential and an exponential repulsive potential; (3) the surface is flat so that the tangential velocity component of the gas atom is unchanged; (4) the surface oscillators have an equilibrium energy distribution at the temperature of the solid. This model represents a logical successor to the 'hard-cube' model introduced by Logan and Stickney (J. Chem. Phys. 44, 195 (1966)) and allows the important effects involving the collision time and the natural frequency of the surface atoms to be taken into account. (Author)

Descriptors :   (*MOLECULAR BEAMS, SCATTERING), GASES, SURFACES, INTERACTIONS, THEORY, ATOMS, ONE DIMENSIONAL FLOW, OSCILLATION, FREQUENCY, DISTRIBUTION, XENON, SILVER, RAREFIED GAS DYNAMICS

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE