Open Access
Table 1
Overview of performed experiments.
| Series | Molecules | Temperature (a) (K) | H2O column density (b,c) (ML) | Notes |
|---|---|---|---|---|
| Main experiments | H218O(s) + 13C18O(g) | 40 | 57.8 | – |
| H218O(s) + 13C18O(g) | 50 | 56.7 | – | |
| H218O(s) + 13C18O(g) | 60 | 57.6 | – | |
| H218O(s) + 13C18O(g) | 70 | 61.8 | – | |
| H218O(s) + 13C18O(g) | 80 | 62.9 | – | |
| H218O(s) + 13C18O(g) | 90 | 57.8 | – | |
| H218O(s) + 13C18O(g) | 100 | 56.8 | – | |
| H218O(s) + 13C18O(g) | 120 | 58.3 | – | |
| Control | H218O(s) | 40 | 70.2 | Water only |
| H218O(s) + 13CO (g) | 60 | 63.2 | 13C16O | |
| H218O(s) + 13C18O(g) | 40 | 66.4 | No VUV irradiation | |
Notes. (a)All ices have been deposited at 15 K. The temperature refers to the value at which the ASW is VUV irradiated. (b)The H2O column density is derived through the integrated area of the OH-stretching mode (boundaries, 3800–2950 cm−1) through Eq. (1), where A′ is taken to be 1.5 × 10−16 cmmolecule−1 (H216O, Bouilloud et al. 2015). (c)It is likely that this value represents a lower limit due to the nonlinearity of RAIRS at column densities above 10 ML.
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