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A medium-resolution (AX/X 0.0t5) spectrum of Saturn in the 7.5-13.5 range is presented. The observed low brightness temperature between 9 and 11 of about K rules out gaseous NH3 as the dominant absorber in this spectral range. Absorption features due to PH3 may be present around 10 , and cloud particles could be an important source of opacity in this wavelength range. There are strong indications of a temperature inversion in the upper atmosphere, including high brightness temperature in the 7.7-j CH4 band, and possible emission from C2H6 around 12 M Subject headings: atmospheres, planetary - Infrared - Saturn
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Gillett et al. (1974) studied this question.
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