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L. R. Brown, V. Nemtchinov (Jet Propulsion Laboratory), C. Cottaz, I. Kleiner, G. Tarrago (Laboratoire de Photophysique Moleculaire)
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 2\nu2 and \nu4 between 5 and 8 micron and 2\nu4, \nu1 and \nu3 near 3 micron. To characterize the 5 micron window, several hot bands have been studied; these include 3\nu2 (s) - \nu2 (a), 3\nu2 (a) - \nu2 (s), \nu2 + \nu4 (s) - \nu2 (s) and \nu2 + \nu4 (a) - \nu2 (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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