Table 1
Positions and attributions of infrared absorption bands of methanimine
(CH2NH) at 50 K, hydrogen cyanide (HCN) at 20 K, ammonium cyanide
([
−CN])
at 20 K, pure aminoacetonitrile at 130 K, and refractory residues at 260 K.
| Ices | Wavenumber | Attribution |
| (cm -1 ) | ||
|
|
||
| Methanimine (CH 2 NH) | 3266 | ν(N-H) |
| (ϵ NH3, 50 K) | 3162/3140 | νas(C-H) |
| (Hamada et al. 1984; Jacox & Milligan 1975) | 2987/2916/2886 | νs(C-H) |
| 2206 | Harmon or comb? | |
| 2144 | Harmon or comb? | |
| 1642/1634 | ν(C = N) | |
| 1411 | δ(CH2) | |
| 1186 | δ(NH2) | |
| 1112 | τ( NH) | |
| 1077 | ω(CH2) | |
| 1069 | ρ(CH2) | |
|
|
||
| Hydrogen cyanide (HCN) | 3114 | ν(C-H) |
| (pure, 20 K) | 2100 | ν(CN) |
| (Gerakines et al. 2004) | 1618 | Harmon |
| 849 | δ(NCH | |
|
|
||
Ammonium cyanide [
−
CN]
|
3216 | Comb |
| (NH3 content, 20 K) | 3024 | ν(NH) |
| (Clutter & Thompson 1969; Gerakines et al. 2004) | 2956 | Comb |
| 2771 | Harmon | |
| 2080/2065 | −CN Comb/n | |
| 1628 | δ(NH) | |
| 1488 | δ(NH) | |
|
|
||
| Aminoacetonitrile | 3367 | νas(NH2) |
| (NH2CH2CN) | ||
| (pure, 130 K) | 3271 | νs(NH2 |
| (Bernstein et al. 2004) | 2981 | νas(CH2) |
| 2945 | νs(CH2) | |
| 2240 | ν(CN | |
| 1595 | δ(NH2) | |
| 1424 | δ(CH2) | |
| 1335 | δ(CH2) | |
| 1095 | ν(C-N) | |
| 928 | ω(NH | |
|
|
||
| Refractory residues | 3347 | ν(NH2) |
| (260 K, based on PEI attributions) | 3269 | NH ? |
| (Kuptsov & Zhizhin 1998) | 2913 | ν(CH2) |
| 2840 | ν(CH2) | |
| 2230 | ν(CN) | |
| 1598 | δ(NH) | |
| 1450 | δ(CH) | |
| 1359 | δ(CH) | |
| 1100 | ν(CN) | |
Notes. Vibration mode: stretching (ν), bending (δ), rocking (ρ), torsion (τ), wagging (ω). Type of vibration mode: asymmetric (as), symmetric (s). Comb: combination mode. Harmon: harmonic mode.
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