Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.1916d&link_type=abstract
American Astronomical Society, DPS meeting #39, #19.16; Bulletin of the American Astronomical Society, Vol. 39, p.447
Astronomy and Astrophysics
Astronomy
Scientific paper
New high-precision laboratory measurements are now being conducted to measure the opacity of ammonia in a hydrogen/helium atmosphere in the 2-4 mm wavelength range. Previous single-wavelength measurements conducted at 3.2 mm (Joiner and Steffes, 1991 and Mohammed, 2005) gave little insight into the frequency dependence of ammonia opacity and were limited by the sensitivity of their equipment. New results have been obtained for the ammonia continuum using an enhanced high precision measurement system with a confocal mirror resonator.
Preliminary measurements of the ammonia continuum opacity (2.5 - 4 mm wavelength range) under Jovian conditions have been made with a gas mixture consisting of 84.7% hydrogen, 13.3% helium and 2-4 % ammonia and at pressures of 1-3 bars at 290 K. Future measurements will be conducted at temperatures of 218K and 204K and shorter wavelengths extending down to 2 mm. These results will be used to verify which model best predicts the opacity of ammonia under Jovian conditions at these wavelengths. The 2-4 mm wavelength range has been extensively used for disk averaged emission measurements of the outer planets and for interferometric mapping of Saturn (Griffin and Orton 1993, Muhleman and Berge, 1991 and van de Tak et. al, 1999). These laboratory measurements could potentially influence the interpretation of these observations.
This work is supported by the NASA Planetary Atmospheres Program under Grant NNG06GF34G.
Devaraj Kiruthika
Steffes Paul Gregory
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