FIELD DISTRIBUTION EFFECTS IN LASER-DRIVEN DIFFUSION THROUGH METAL CAPILLARIES

A new approach for the IR laser driven diffusion through metal capilla ries is reported in this paper. It reveals the influence of the inner distribution of the electromagnetic field on the resonant character of the diffusion of a mixture of SF6 (resonant) and N2 through an Ni cap illary under IR irradiation. A waveguide model is proposed for the con sidered e.m. field-heterogeneous system interaction, an explanation fo r the persistence of the selective effects even at total pressures as high as 7 Torr being provided. Some spectral differences between the i nside-capillary molecules and bulk-phase molecules are pointed out usi ng a simple attenuation measurement method.