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Infrared spectroscopy has been used to detect HO(2) and HO(3) radicals in H(2)O + O(2) ice mixtures irradiated with 0.8 MeV protons. In these experiments, HO(2) was formed by the addition of an H atom to O(2) and HO(3) was formed by a similar addition of H to O(3). The band positions observed for HO(2) and HO(3) in H(2)O-ice are 1142 and 1259 cm(-1), respectively, and these assignments were confirmed with (18)O(2). HO(2) and HO(3) were also observed in irradiated H(2)O + O(3) ice mixtures, as well as in irradiated H(2)O(2) ice. The astronomical relevance of these laboratory measurements is discussed.
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Cooper et al. (2006) studied this question.
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