Upper limits on hydrogen halides in Jupiter from Cassini/CIRS observations

We have determined the following upper limits for the mole fraction of hydrogen halides in Jupiter's atmosphere from Cassini/CIRS observations: [HF] < 2.7 x [10.sup.-11], [HCI] < 2.3 x [10.sup.-9], [HBr] < 1.0 x [10.sup.-9], [HI] < 7.6 x [10.sup.-9]. These limits are smaller than solar composition for HF and HC1, and support the halogens' condensation in ammonium salts predicted by thermochemical models for the upper jovian troposphere. Keywords: Jupiter, atmosphere; Atmospheres, composition; Abundances, atmospheres