COLLISION-INDUCED FIRST OVERTONE BAND OF $H_{2}$ IN $H_{2}-Kr$ AND $H_{2}-XE$ MIXTURES
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Date
1999
Journal Title
Journal ISSN
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Publisher
Ohio State University
Abstract
Enhancement of the collision-induced absorption (CIA) spectra of the first overtone band of $H_{2}$ in the $H_{2}-Kr$ and $H_{2}-Xe$ binary mixtures were recorded at 295 K for base densities of $H_{2}$ in the range 30-57 amagat and for partial densities in the range 50-250 amagat for each of Kr and Xe. The observed spectra consist fo single transitions $O_{2}(J), Q_{2}(J)$, and $S_{2}(J)$ corresponding to the selection rule $\Delta J = -2, 0$, and 2, respectively. Binary, ternary, and quarternary absorption coefficients of the band arising from collisions of the type $H_{2}-X, H_{2}-X-X, H_{2}-H_{2}-X, H_{2}-X-X-X, H_{2}-H_{2}-X-X$, and $H_{2}-H_{2}-H_{2}-X$, where X represents Kr or Xe, have been determined. The spectra are interpreted fully in terms of the quadrupolar induction $mechanism.^{a}$ Analysis of the absorption profiles of the observed spectra was carried out using the Birnbaum-Cohen line-shape $function^{b}$ for individual components of the band and characteristic line shape parameters were determined from the analysis.
Description
$^{a}$ See S.P. Reddy in Phenomena Induced by Intermolecular Interactions, edited by G. Birnbaum, Plenum. New York, 1985, p.129. $^{b}$ G. Birnbaum and E.R. Cohen, Can. J. Phys. 54, 593 (1976).
Author Institution: Department of Physics and Physical Oceanography, Memorial University of Newfoundland
Author Institution: Department of Physics and Physical Oceanography, Memorial University of Newfoundland