New laboratory measurements on ammonia's inversion spectrum, with implications for planetary atmospheres

Details New laboratory measurements on ammonia's inversion spectrum, with implications for planetary atmospheres New laboratory measurements on ammonia's inversion spectrum, with implications for planetary atmospheres

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5539s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E3, p. 5539-5548.

Astronomy and Astrophysics

Astronomy

9

Absorption Spectra, Ammonia, Gas Giant Planets, Microwave Absorption, Planetary Atmospheres, Absorptivity, Microwave Spectra, Planets, Atmosphere, Laboratory Studies, Ammonia, Spectra, Analysis, Microwave Methods, Wavelengths, Parameters, Absorption, Gas Planets, Comparisons, Outer Planets, Spectrometry, Equipment, Procedure, Data, Calculations, Frequencies, Pressure, Abundance, Gases, Hydrogen Sulfide, Temperature

Scientific paper

Microwave spectral measurements have been performed on pure room-temperature gaseous ammonia at frequencies from 1.75 to 18 GHz (1.7-17 cm), at 50-, 100-, and 300-torr pressures. These measurements are part of a laboratory program to measure the microwave absorption spectrum of ammonia, under conditions applicable to giant planet atmospheres, now in progress at the Jet Propulsion Laboratory. The pure ammonia data reported here agree well with previous data by Bleaney and Loubser (1950) at 100 and 300 torrs, and with predictions of the absorptivity formalism published by Berge and Gulkis. Success with pure ammonia but failure with mixtures of ammonia in hydrogen and helium (Spilker, 1990) indicates that the Berge and Gulkis formalism does not correctly handle foreign-gas effects on ammonia inversion lines. This may require modifying conclusions of radio astronomical and radio occultation studies that used this formalism. Notably, a suggested depletion of ammonia and superabundance of hydrogen sulfide may have been exaggerated as a result of inaccuracies in the Berge and Gulkis formalism.

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