LIGHT-INDUCED DRIFT OF A SINGLE-COMPONENT GAS IN CAPILLARIES

The single-component gas drift in capillaries under resonance optical emission is studied theoretically. The surface and so-called collision al mechanisms of the phenomenon due, correspondingly, to the differenc e in the accomodation coefficients and collisional cross-sections of e xcited and unexcited particles are analyzed. The phenomenon of light-i nduced pressure difference in a closed cuvette is studied. The hydrody namic, intermediate and Knudsen drifts regimes are considered. As a re sult, the dependences of kinetic coefficients on the Knudsen number ar e obtained. A possibility of varying the drift direction in the interm ediate regime observed before is described. The comparison between the theory and experiment is performed.