The NH3 spectrum in Saturn's 5 micron window

Details The NH3 spectrum in Saturn's 5 micron window The NH3 spectrum in Saturn's 5 micron window

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..880f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 15, 1983, p. 880-888.

Astronomy and Astrophysics

Astrophysics

16

Ammonia, Atmospheric Composition, Infrared Spectra, Infrared Windows, Saturn Atmosphere, Abundance, Line Spectra, Molecular Spectra, Spectrum Analysis, Water Vapor, Saturn, Ammonia, Spectra, Itf, Infrared Telescope Facility, Origin, Absorption, Comparisons, Intensity, Theoretical Studies, Flux, Abundance, Infrared, Observations, Wavelengths

Scientific paper

Spectra of Saturn's 5-micron window were obtained at the Infrared Telescope Facility on Mauna Kea, Hawaii. The spectra have a resolution of 1.2/cm, and some exhibit extremely low amounts of approximately 300-micron ppt telluric H2O. The Saturn spectra show absorptions by the 2nu2 band of NH3. Long-path laboratory comparison spectra of NH3 were acquired and show considerable deviations in intensity from theoretical predictions. The calibration of Saturn's observed NH3 features with the laboratory data gives 2.0 + or - 0.5 m-amagat of NH3 using the 2nu2 Q-branch at 5.32 microns. The R(1) and R(2) lines yield an abundance about 3 times greater. Absorptions outside the range of the Q-branch can be accounted for by solid NH3 of 10-20 microns equivalent path length. The origin of Saturn's 5-micron flux is mostly thermal with some admixture of solar reflected radiation. A depletion of Saturn's NH3 abundance below the solar value is indicated, but confirmation of this conclusion will require a better understanding of the atmospheric penetration depth at 5 microns and more rigorous modeling of the spectral line formation.

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