Band parameters and k coefficients for self-broadened ammonia in the range 4000-11,000 cm-1.

Details Band parameters and k coefficients for self-broadened ammonia in the range 4000-11,000 cm-1. Band parameters and k coefficients for self-broadened ammonia in the range 4000-11,000 cm-1.

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jqsrt..62..193i&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 62, issue 2, pp. 193-204

Computer Science

15

Ammonia: Molecular Data, Ammonia: Laboratory Spectra, Ammonia: Infrared Spectra, Ammonia: Planetary Atmospheres

Scientific paper

Analysis of the near-infrared spectra of the outer planets is hampered by the scarcity of reliable line data for methane and ammonia which both have very complicated spectra in this region. Until reliable line data is gathered, band models which are based upon the laboratory measurement of the transmission spectra of the gases under conditions similar to those found in planetary atmospheres must be used. This has been done extensively for methane by previous investigators but analysis of the ammonia spectrum is more difficult due to the corrosive nature of this gas. Furthermore ammonia at the pressures and cold temperatures found in the gas giant atmospheres is close to condensation. However there is increased interest in the spectroscopy of ammonia as a result of the success of the Galileo mission, and the authors present measurements and analysis of ammonia transmission spectra originally measured in 1984 but never previously published until now. These data have been fitted with band models and k-distribution models and they present the results of both these analyses. The data set uniquely covers the near-infrared range vital for the analysis of data from the Galileo near-infrared mapping spectrometer (NIMS) instrument and hence until further measurements can be made, these are the best and only data that exist to analyse ammonia in the near infrared spectra of the gaseous planets.

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