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Table 1
Infrared absorption bands and vibrational assignments of CH3NH2 and H2CO in pure solids and in a water ice environment at 20 K.
| Assignement | Wavenumbers (cm-1) | Band strength (cm molec-1) | |
| Pure solid | H2O:CH3NH2:H2CO (1/2/0.1) |
|
|
|
|
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| CH3NH2a | |||
| ν(NH) | 3334 | 3356 | |
| ν(NH) | 3282 | 3295 | |
| ν(NH)bonded | 3180 | 3200 | |
| ν(CH) | 2943 | 2952 | |
| ν(CH) | 2882 | 2889 | |
| ν(CH) | 2792 | 2799 | |
| δ(NH2) | 1615 | 1614 | 4.3 × 10-18 |
| δ(CH3) | 1477, 1455 | 1477, 1455 | |
| δ(CH3) | 1425 | 1420 | |
| ρ(CH3) | 1157 | 1171 | 1.5 × 10-18 |
| ν(C–N) | 1042 | 1038 | |
| ω(NH) | 997, 896 | 998, 935 | 1.1 × 10-17 |
| H2COb | |||
| ν(CH) | 2998 | ||
| ν(CH) | 2900 | 2.2 × 10-18 | |
| ν(C=O) | 1715 | 1717 | 9.6 × 10-18 |
| δ(CH) | 1492 | 1497 | 4 × 10-18 |
| δ(CH) | 1247 | 1351 | 1.1 × 10-18 |
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