Context.H2O is the most abundant component of astrophysical ices. In most lines of sight it is not possible to fit both the H2O 3 μm stretching, the 6 μm bending intensities with a single pure H2O spectrum. Recent Spitzer observations have revealed CO2 ice in high abundances and it has been suggested that CO2 mixed into H2O ice can affect the positions, shapes and relative strengths of the 3 μm and 6 μm bands.
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Öberg et al. (2006) studied this question.
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