Table 2
Infrared absorption wavenumber of precursors for the non-irradiated H2O:CO:CH3OH ices.
| Molecule | ν (cm–1) | Identification | Aυ |
|---|---|---|---|
| H2O | 3655 | db-OH | – |
| H2O | 3630 | db-OH | – |
| H2O | 3335 | O–H str | 20 |
| CH3OH | 2997 | C–H | |
| CH3OH | 2960 | C–H str as | |
| CH3OH | 2935 | C–H | |
| CH3OH | 2915 | C–H | |
| CH3OH | 2834 | C–H strs | |
| CH3OH | 2600 | comb | |
| CH3OH | 2540 | comb | |
| H2O | 2200 | comb | |
| CO | 2150 | C–O str | |
| CO | 2138 | C–O str | 1.1 |
| 13CO | 2100 | C–O str | |
| 13CO | 2090 | C–O str | |
| H2O | 1650 | bend | |
| CH3OH | 1478 | CH3 def | |
| CH3OH | 1464 | CH3 def | |
| CH3OH | 1450 | CH3 def | |
| CH3OH | 1426 | CH3 def | |
| CH3OH | 1262 | CH3 def | |
| CH3OH | 1124 | CH3 rock | 1.57 |
| CH3OH | 1017 | C–O str | |
| H2O | 750 | lib. wing |
Notes. The A-values (×1016 cm mol−1 ) were taken from de Barros et al. (2022). Abbreviations for the IR identification are dangling bonds (db), asymmetric (as), symmetric (s), combination (comb), stretch (str), scissors (scis), bending (bend), deformation (def), libration (lib), winging (wing), and rock (rock).
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