Laboratory transmission IR spectra of relatively thick films (up to ∼500 μm) of mixed H2O and SO2 ices were measured at several temperatures between 10 and 130 K in the range 5000-450 cm−1. In addition to the strong features due to crystalline SO2 the spectra reveal bands at ∼3668 cm−1, 3634 cm−1 (with some structure) and 3300 cm−1 which are identified with H2O in SO2 environment. Also, there is no overlap between any of the H2O bands with the 3584 cm−1 band of SO2 at any temperature in the above range. The implication of this result is that H2O, if present on Io, must be far less than 1 part in 105 SO2.
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Dahmani, R., Khanna, R.K. H2O on Io? IR spectra of SO2/H2O mixed ices in the 5000-450 cm−1 region. Astrophys Space Sci 236, 125–133 (1996). https://doi.org/10.1007/BF00644326
- Thick Film
- Strong Feature
- Laboratory Transmission