Table 1.
IR absorption band positions of pure NH2CHO ice and the new species formed after the UV irradiation of NH2CHO.
| Molecule | Band position | Vibration mode | Band strength |
|---|---|---|---|
| (cm−1) | (cm molecule−1) | ||
| NH2CHO | 3355 | νa (N–H) | 1.4 × 10−16 (a) |
| 3170 | νs (N–H) | ||
| 2878 | ν (C–H) | 4.7 × 10−18 | |
| 1690 | ν (C=O) | 6.5 × 10−17 | |
| 1631 | δ (N–H) | ||
| 1386 | δi (C–H) | ||
| 1324 | ν (CN) | ||
| NH3 | 3375 | ν (N–H) | |
 |
3210 | ν (N–H) | |
| 3065 | ν (N–H) | ||
| 1483 | δ (N–H) | ||
| CO2 | 2341 | νa (C–O) | 7.6 × 10−17 (b) |
| 13CO2 | 2277 | νa (C–O) | |
| HNCO | 2259 | νa (N=C=O) | 7.2 × 10−17 (c) |
| 2240 | νa (N=C=O) | ||
| OCN− | 2163 | νa (N=C=O) | 1.3 × 10−16 (c) |
| CO | 2138 | ν (C≡O) | 1.1 × 10−17 (d) |
| HCN | 2100 | ν (C≡N) | 1.1 × 10−17 (e) |
Notes. Only the band strengths of those modes are reported when the respective column densities were evaluated.
The band strength corresponds to (νa + νs). All the band strength values are taken from Brucato et al. (2006a).
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