Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icar..140..235h&link_type=abstract
Icarus, Volume 140, Issue 1, pp. 235-238.
Physics
3
Scientific paper
It has been suggested that phosphine (PH_3) may contribute significantly to the microwave emission spectrum of Neptune, and to the centimeter-wavelength opacity measured by the Voyager 2 spacecraft at Neptune (D. R. DeBoer and P. G. Steffes 1996a, Icarus 123, 324-335). As a result, laboratory measurements of the microwave opacity and refractivity of PH_3 in an H_2/He atmosphere have been conducted at 1.5 GHz (20 cm), 2.2 GHz (13.3 cm), 8.3 GHz (3.6 cm), 13.3 GHz (2.3 cm), and 21.6 GHz (1.4 cm) at pressures of 1, 3, and 5 bars at room temperature. Results indicate that current theories significantly understate the centimeter-wavelength opacity of PH_3. This higher-than-expected opacity is likely due to a molecular inversion spectrum, of which no measurements have been reported. These results will elucidate the interpretation of centimeter-wavelength microwave observations from radio telescopes and spacecraft radio occultation measurements of the atmospheres of all four jovian planets.
Deboer David Robert
Hoffman James Patrick
Steffes Paul Gregory
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