Collison-induced absorption by H2-He pairs in the H2 fundamental band at 78 and 298 K

Details Collison-induced absorption by H2-He pairs in the H2 fundamental band at 78 and 298 K Collison-induced absorption by H2-He pairs in the H2 fundamental band at 78 and 298 K

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phrva..51.1209b&link_type=abstract

Physical Review A (Atomic, Molecular, and Optical Physics), Volume 51, Issue 2, February 1995, pp.1209-1213

Physics

9

Infrared Spectra, Line And Band Widths, Shapes, And Shifts

Scientific paper

Measurements of collision-induced absorption spectra in the H2 fundamental band are reported for gaseous mixtures of hydrogen and helium at temperatures of 78 and 298 K and frequencies from about 3900 to 5200 cm-1. Spectral line shapes are calculated from the fundamental theory with the isotropic interaction approximation, which has been successful in all previous comparisons of the kind for pure hydrogen and hydrogen-rare-gas mixtures. In the present case, however, the comparison of measured and calculated absorption profiles suggests that small differences between theory and measurement may exist for H2-He in the H2 fundamental band, which are marginaly greater than the combined uncertainties of theory and measurement. Presumably, these are due to the neglect of the anisotropy of the interaction; the H2-He system in the H2 fundamental band is more sensitive to the anisotropy of the interaction than the systems and bands studied previously.

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