Absorption in the troughs of the far infrared spectra of NH3 and mixtures of NH3 and H2.

Details Absorption in the troughs of the far infrared spectra of NH3 and mixtures of NH3 and H2. Absorption in the troughs of the far infrared spectra of NH3 and mixtures of NH3 and H2.

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jqsrt..64...47b&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 64, issue 1, pp. 47-65

Statistics

Computation

6

Ammonia: Infrared Spectra, Ammonia: Laboratory Spectra, Ammonia: Infrared Absorption, Ammonia: Jupiter

Scientific paper

The absorption coefficients in the troughs between the J-multiplets of the far infrared rotation-inversion spectrum of NH3 and NH3 broadened by H2 were measured at 296 K in the region from about 65-230 cm-1. Wave numbers were selected in the troughs that are removed from nearby weak absorption lines, and measurements of the absorption versus the density of NH3 and of H2 verified that the absorption was due to the wings of distant rather than nearby spectral lines. These measurements were compared with computations of the absorption arising from binary collisions of NH3-NH3 and NH3-H2 for uncoupled Lorentz lines. Except at the lowest and highest frequencies, the measured continuum absorption in the troughs was less than the computed absorption, a discrepancy that increased with increasing frequency. An improved representation of the measured absorption was obtained by fitting the Rosenkrantz line shape with the Ben-Reuven formulation of the line coupling coefficient of the inversion J-doublets. The application of these results to the spectrum of Jupiter shows clear differences between the spectrum of the above model and the Lorentz line shape, with the largest differences occurring in the dearest troughs.

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