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A study of the interaction between nonspherical molecules and a surface using the thermomagnetic effect in a Knudsen gas

1983; Elsevier BV; Volume: 117; Issue: 2-3 Linguagem: Inglês

10.1016/0378-4371(83)90130-9

1873-2119

V. D. Borman, S. Yu. Krylov, B.I. Nikolayev, V. I. Troyan, B.A. Frolov,

Optical properties and cooling technologies in crystalline materials

The paper deals with the use of thermomagnetic effect in a Knudsen gas (i.e., the effect of the magnetic field on the heat flow between two surfaces) in studying nonspherical scattering of polyatomic molecules from a solid surface. The dependence of the effect on the field orientation has been experimentally investigated for the first time. As a result, it has become possible to establish the ranks of the tensors that determine the dependence of the scattering probability on the orientation of the angular momentum of a molecule. A new approach for constructing a theory of the effect has been proposed. This approach takes account of the arbitrary law of spherically symmetric scattering and examines the case of appreciable values of the nonsphericity parameters. From a comparison between the theoretical and experimental dependences of the heat flow on the field magnitude and orientation the expressions for the probability of inelastic nonspherical scattering of N2 and CO molecules by gold and platinum surfaces have been obtained.