Far-infrared absorption in H2 and H2-He mixtures

Details Far-infrared absorption in H2 and H2-He mixtures Far-infrared absorption in H2 and H2-He mixtures

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jqsrt..19...51b&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 19, Jan. 1978, p. 51-62.

Physics

31

Absorption Spectra, Far Infrared Radiation, Helium, Hydrogen, Infrared Absorption, Gas Mixtures, Infrared Spectra, Molecular Rotation, Planetary Atmospheres

Scientific paper

Collision-induced absorption in the translation-rotation band of H2 and H2-He mixtures has been measured from 20 to 900 kaysers at 77.4, 195, and 292 K. To establish the accuracy of the results, various sources of error are investigated. The zeroth and first spectral moments are evaluated from experiment and theory for H2 at the various temperatures. To obtain theoretical moments consistent with the experimental values, the quantum pair-distribution function must be used. The major portion of the experimental moments can be accounted for by quadrupole-induced dipoles in H2 pairs. The remaining portion is attributable to an anisotropic overlap interaction, although its magnitude depends on the value of the molecular parameters required to calculate the quadrupole contribution.

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