ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Enhancement of the collision-induced absorption (CIA) spectra of the first overtone infrared band of H2 in the H2–Kr and H2–Xe binary mixtures were recorded at 295 K for base densities of H2 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 of single transitions O2(J), Q2(J), and S2(J) corresponding to the selection rule ΔJ=−2, 0, and 2, respectively. Binary, ternary, and quarternary absorption coefficients of the band arising from collisions of the type H2–X, H2–X–X, H2–H2–X,H2–X–X–X, H2–H2–X–X, and H2–H2–H2–X, where X represents Kr or Xe, have been determined from the integrated absorption coefficients of the band. The spectra are interpreted in terms of the quadrupolar induction mechanism and no evidence of the contribution from the isotropic overlap induction mechanism is found unlike in the CIA spectra of the fundamental band of H2 [see S. P. Reddy, in Phenomena Induced by Intermolecular Interactions, edited by G. Birnbaum (Plenum, New York, 1985), p. 129]. Analysis of the absorption profiles of the observed spectra was carried out using the Birnbaum–Cohen line-shape function [G. Birnbaum and E. R. Cohen, Can. J. Phys. 54, 593 (1976)] for individual components of the band and characteristic line shape parameters were determined from the analysis. © 1997 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.474853
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