The theory of radical recombination luminescence communication 3. Kinetics of radical recombination luminescence
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The kinetic isotherms of radical recombination luminescence (RRL) in the case of excitation by atomic hydrogen are different for well cleaned and insufficiently cleaned surfaces. In the first case the kinetic curve rises, in the second it drops, which is explained by the presence on the insufficiently cleaned surface of remains of preliminarily chemisorbed hydrogen, existing in the charged state, which is gradually removed from the surface as a result of a recombination reaction.
After the cessation of RRL, the content of the charged form of chemisorption on the surface at first increases, but then begins to drop as a result of desorption. The initial rising branch of the curve is responsible for an approach of the system to electronic equilibrium, which remained disturbed in the process of RRL.
After cessation of the discharge, and then its subsequent turning on after a certain pause, a “memory effect” is observed: the nature of the kinetics of RRL depends on the duration of the pause. This is due to the fact that after the pause, depending on its duration, various amounts of chemisorbed hydrogen, participating in the RRL, remain on the surface.
KeywordsHydrogen Recombination Atomic Hydrogen Charged State Chemisorption
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