INFLUENCE OF BULK DIFFUSION OF RUBIDIUM AND SODIUM ATOMS ON THE TIME OF THEIR ADSORPTION ON THE GLASS SURFACE
S. N. Atutov1, F. A. Benimetskii1,2, O. A. Makarov1,2
1Institute of Automation and Electrometry, Siberian Branch Russian Academy of Sciences, pr. Akademika Koptyuga 1, Novosibirsk 630090
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090
Keywords: столкновение атомов с поверхностью стекла, время пребывания, вероятность адсорбции и десорбции, collision of atoms with the glass surface, residence time, probability of adsorption and desorption
Abstract
This paper presents the results of measurement of the surface potential and the residence time of Rb and Na atoms on the surface of S-52 molybdenum glass. It is found that at temperatures below the glass transition temperature, the temperature dependence of the residence time of Rb atoms is well described by the Arrhenius formula. The surface potentials for Rb and Na are measured to be 0.67 and 1.37 eV, respectively. At temperatures above the glass transition temperature, the residence time of these atoms abnormally increases. This is due to the fact that during impact of an atom on the surface of molten glass, it can penetrate into the volume of the window and then return by diffusion and desorb from the surface. In this case, the residence time of the atom on the glass is determined by the diffusion time and can be very significant, despite the relatively low potential barrier at the surface and heat.
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