H2-broadened H216O in four infrared bands between 55 and 4045 cm-1.

Details H2-broadened H216O in four infrared bands between 55 and 4045 cm-1. H2-broadened H216O in four infrared bands between 55 and 4045 cm-1.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jqsrt..56..263b&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 56, issue 2, pp. 263-282

Other

21

Water Vapor: Line Broadening, Water Vapor: Infrared Spectra, Water Vapor: Laboratory Spectra

Scientific paper

To support the remote sensing of the outer planets, absorption spectra of H2O broadened by H2 were recorded at room temperature using two Fourier transform spectrometers. The data from 1260 to 2070 cm-1 and 3420 to 4045 cm-1 were obtained at 0.0056 and 0.012 cm-1 resolution (unapodized), respectively, with the McMath FTS located at Kitt Peak National Observatory/ National Solar Observatory. The remainder of the spectral data from 55 to 328 cm-1 was taken at 0.0056 cm-1 with the HR120 Bruker FTS at the Jet Propulsion Laboratory. Some 630 H2-broadened linewidths of H216O were obtained with precisions of 2-7% for the four strongest water bands: rotational at 0 cm-1; ν2 at 1595 cm-1; ν1 at 3657 cm-1 and ν3 at 3756 cm-1. The intensity of the weakest measured transition was 0.0065 cm-2/atm at room temperature. Within a band, the widths varied from 0.101 to 0.033 cm-1/atm at room temperature for 0≤J≤12 and 0≤Ka≤6. Systematic patterns were detected in the widths as a function of ΔJ, J, Ka, and asymmetry. At low Ka, the widths decreased with increasing J, but for Ka>2, the widths generally increased with increasing J. Examination of the vibrational dependencies of the three perpendicular bands also revealed that the widths of the ν2 and rotational transitions were nearly the same (within 3%), but the widths of ν1 were generally larger (up to 18%). The limited width measurements reported by others in the pure rotational and 1.4 μm regions supported the conclusions concerning vibrational dependencies.

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