A New Model of the Hydrogen and Helium-Broadened Microwave Opacity of Ammonia Based on Extensive Laboratory Measurements

Details A New Model of the Hydrogen and Helium-Broadened Microwave Opacity of Ammonia Based on Extensive Laboratory Measurements A New Model of the Hydrogen and Helium-Broadened Microwave Opacity of Ammonia Based on Extensive Laboratory Measurements

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.5408h&link_type=abstract

American Astronomical Society, DPS meeting #40, #54.08; Bulletin of the American Astronomical Society, Vol. 40, p.497

Astronomy and Astrophysics

Astronomy

Scientific paper

Close to 2000 laboratory measurements of the microwave opacity and refractivity of NH3 in a H2/He atmosphere have been conducted in the 1.1-20 cm wavelength range (1.5-27 GHz) at pressures from 30 mBars to 12 Bars and at temperatures from 184 to 450 K. The mole fraction of NH3 ranged from 0.06% to 6% with some additional measurements of pure NH3. The high accuracy of these results have enabled development of a new model for the opacity of NH3 in a H2/He atmosphere under Jovian conditions. The model employs the Ben-Reuven lineshape applied to the published inversion line center frequencies and intensities of NH3 (JPL Catalog - Pickett et al., 1998) with empirically-fitted line parameters for H2 and He broadening, and for the self-broadening of some previously unmeasured ammonia inversion lines. The new model for ammonia opacity will provide reliable results for temperatures from 150 to 500K, at pressures up to 50 Bars and at frequencies up to 40 GHz. These results directly impact the retrieval of Jovian atmospheric constituent abundances from the Galileo Probe radio signal absorption measurements, from microwave emission measurements conducted with earth-based radio telescopes and with the future NASA Juno mission, and studies of Saturn's atmosphere conducted with the Cassini Radio Science Experiment and the Cassini RADAR 2.1 cm passive radiometer.
This work was supported by NASA Contract NNM06AA75C from the Marshall Space Flight Center supporting the Juno Mission Science Team, under Subcontract 699054X from the Southwest Research Institute and by the NASA Planetary Atmospheres Program under Grant NNG06GF34G.

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