Revised Molecular Line Parameters of Ammonia

Details Revised Molecular Line Parameters of Ammonia Revised Molecular Line Parameters of Ammonia

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.5703b&link_type=abstract

American Astronomical Society, DPS Meeting #32, #57.03; Bulletin of the American Astronomical Society, Vol. 32, p.1108

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The line parameters of ammonia for the HITRAN and GEISA databases have been revised using new laboratory studies of line positions and intensities measured at 0.0056 and 0.011 cm-1 resolution with the McMath Fourier transform spectrometer located at Kitt Peak National Observatory. The vibrational bands analyzed recently are 2ν 2 and ν 4 between 5 and 8 micron and 2ν 4, ν 1 and ν 3 near 3 micron. To characterize the 5 micron window, several hot bands have been studied; these include 3ν 2 (s) - ν 2 (a), 3ν 2 (a) - ν 2 (s), ν 2 + ν 4 (s) - ν 2 (s) and ν 2 + ν 4 (a) - ν 2 (a) located at 1416., 1963., 1608. and 1618. cm-1, respectively. For this longer wavelength region, more than 1600 line intensity measurements have been modeled to 5% for the cold bands and 8% for the hot bands so that a complete spectrum can be predicted from theoretical models. To complete the database, empirical expressions for foreign-broadened line widths (derived by Nemtchinov from measurements at 10 micron) have been applied to all ammonia transitions in the database up to 2 microns. Part of the research reported in this paper was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

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