Infrared absorption spectra of gaseous HD. III. Collision-induced fundamental band of HD in HD--Kr and HD--Xe mixtures at room temperature

Journal Article · Sat Jan 15 04:00:00 EST 1977 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.433945· OSTI ID:7130555

Prasad, R D.G.; Reddy, S P

Spectra of the enhancement of absorption of the collision-induced infrared fundamental band of HD in HD--Kr and HD--Xe mixtures have been investigated at room temperature for different base densities of HD and a number of total gas densities up to 140 amagat. These spectra exhibit a narrow line at the R/sub 1/(1) position, in addition to the well known collision-induced O, Q, and S branches. The occurrence of this new feature in the enhancement spectra, as explained recently by us elsewhere, is due to a phenomenon termed ''intracollisional interference.'' The binary absorption coefficients of the band derived from the measured integrated absorption coefficients are (6.3 +- 0.1) x 10/sup -35/ and (10.1 +- 0.3) x 10/sup -35/ cm/sup 6/ s/sup -1/ for HD--Kr and HD--Xe, respectively. The characteristic half-width parameters, delta/sub d/ and delta/sub c/ of the overlap-induced transitions, and delta/sub q/ (and delta/sub q prime/) of the quadrupole-induced transitions are derived for both HD--Kr and HD--Xe from an analysis of the profiles of the enhancement of absorption. As described in Papers I and II of this series for other binary mixtures of HD, the variation of delta/sub c/, the half-width of the intercollisional dip of the Q branch, with the density of the perturbing gas Kr as well as Xe has been investigated. In both HD--Kr and HD--Xe, the quadrupole-induced transitions show negative wavenumber shifts from the corresponding calculated positions for the free HD molecule. In particular, for HD--Xe, these (approx.7 cm/sup -1/ at a density of 70 amagat of Xe) are found to vary linearly with the partial density of Xe. (AIP)

• Research Organization: Department of Physics, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1C 5S7
• OSTI ID: 7130555
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 66:2; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
CRYOGENIC FLUIDS
DEUTERIDES
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
INFRARED SPECTRA
INTERATOMIC FORCES
MOLECULE COLLISIONS
NONMETALS
SPECTRA
VIBRATIONAL STATES