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Table 1
: Infrared absorption bands and vibrational assignments of NH3 and CH3CHO, in pure solids, in a NH3:CH3CHO ice mixture and a water ice environment at 10 K.
| Assignement | Wavenumbers (cm-1) | Band strength (cm mole-1) | ||
| Pure solid | NH3:CH3CHO | H2O:NH3:CH3CHO | ||
|
|
||||
| NH3 | ||||
| ν(NH) | 3375 | 3370 | ||
| ν(NH) | 3210 | 3210 | ||
| δ(NH) | 1625 | 1631 | 1636 | |
| ω(NH) | 1075 | 1067 | 1120 | 1.3 × 10-17 |
| Acetaldehyde | ||||
| ν(CH) | 3001 | 3001 | ||
| ν(CH) | 2917 | 2958 | ||
| ν(CH) | 2917 | 2915 | ||
| ν(CH) (aldehyde) | 2859–2764 | 2860–2764 | ||
| ν(C = O) | 1715 | 1715 | 1721 | 1.3 × 10-17 |
| δ(CH) | 1426 | 1426 | 1.5 × 10-18 | |
| δ(CH) | 1345 | 1348 | 1351 | |
| ν(C − C) | 1122 | 1123 | ||
Notes. Vibration mode: stretching (ν), bending (δ).
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