Overlap parameters of H/sub 2/-H/sub 2/ molecular pairs from the absorption spectra of the collision-induced fundamental band of H/sub 2/

Journal Article · Tue Mar 01 04:00:00 EST 1977 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.15.975· OSTI ID:7124431

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

The collision-induced fundamental infrared absorption band of H/sub 2/ in the pure gas at 77, 196, and 298 K was recorded for a number of gas densities up to 60 amagat. An analysis of the absorption profiles was performed by assuming appropriate line shapes, and the characteristic half-width parameters delta/sub d/ and delta/sub c/ of the short-range overlap-induced transitions and delta/sub q/ (and delta/sub q/') of the long-range quadrupole-induced transitions were determined. From this analysis the contributions to the intensity of the band from the overlap and quadrupolar interactions were separated. For the H/sub 2/-H/sub 2/ molecular pairs, the overlap parameters, lambda and rho, which give, respectively, the magnitude and range of the overlap dipole moment, and ..mu.. (sigma), the overlap-induced dipole moment at the Lennard-Jones intermolecular diameter sigma, were determined by obtaining the best fit of the calculated overlap parts of the binary absorption coefficients as a function of temperature to the experimental values. The values of the overlap parameters obtained are lambda = 4.53 x 10/sup -3/, rho = 0.23 A, and ..mu.. (sigma) = 2.5 x 10/sup -2/ea/sub 0/.

• Research Organization: Department of Physics, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1C 5S7
• OSTI ID: 7124431
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 15:3; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
640304 -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
COLLISIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HYDROGEN
INFRARED SPECTRA
LINE WIDTHS
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NONMETALS
SPECTRA