Abstract
The goal of this paper is to investigate the relaxation kinetics of vibrationally excited molecules (VEM) under the conditions of a supersonic expansion accompanied by C02 and N20 condensation. The catalyst effect of clusters (Van-der-Waals molecules) on the rate of a vibrational relaxation has been established. The vibrational relaxation rate R c of molecules in bound state and the VEM relaxation probability \(\overline P \) per a collision with a cluster have been determined as functions of a mean molecule number in a cluster (cluster size) \(\overline N \). The values of R C and \(\overline P \) efficiently increase with \(\overline N \). They are independent of a phase cluster state and decrease with the cluster temperature when \(\overline N \) =const. When \(\overline N \)>100, \(\overline P \) tends to unity. For \(\overline N \)=const RC (N20) and \(\overline P \)(N20)> R C (C02) and \(\overline P \)(C02). The VEM desactivation is accompanied by molecule evaporation from cluster surfaces.
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