Collision-induced absorption for H2-H2 and H2-He interactions at 5 microns

Details Collision-induced absorption for H2-H2 and H2-He interactions at 5 microns Collision-induced absorption for H2-H2 and H2-He interactions at 5 microns

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jqsrt..42..141b&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 42, Aug. 1989, p. 141-147. Research supported

Computer Science

8

Helium, Hydrogen, Molecular Absorption, Molecular Collisions, Molecular Interactions, Absorptivity, Jupiter Atmosphere, Molecular Gases, Molecular Spectra, Quantum Mechanics

Scientific paper

Absorption coefficients for collision-induced spectra of H2 have been measured at 299 K between 1830 and 2260 cm. The weak absorption of H2 in this spectral range has been detected by using a 3-m long cell with pressures ranging from 80 to 215 bar. The rototranslational spectrum of H2 has been computed in the high-frequency wing from an extended Birnbaum-Cohen model that fits the results of quantum calculations accurately. The theoretical results for the binary absorption coefficient are generally 3-13 percent larger than the experimental values. The very weak absorption coefficients for H2-He interactions have also been estimated between 1830 and 2200 cm by using pressures of the gas mixtures up to 346 bar. A calculation based on two simple line-shape models, the parameters of which were recently obtained from spectral moments computed with a quantum formalism, yields binary coefficients for H2-He that are in satisfactory agreement with our measurements.

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