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Table 3
Vibrational modes of pure methylamine ice.
| Amorphous(a) | Crystalline(a) | Solid(b) | Solid(c) | ||
|---|---|---|---|---|---|
| Mode | Assignment | 15 K | 101 K | 10 K | 120 K |
| ν10 | NH2 antisymmetric stretch | 3342.8 | 3327.6 | 3348 | 3332 |
| ν1 | NH2 symmetric stretch | 3283.4 | 3287 | 3260 | |
| 3183.2 | 3212.8 | 3189 | 3191 | ||
| 3190.6 | |||||
| 2965.3 | 2962.4 | 2969 | |||
| ν11 | CH3 antisymmetric stretch | 2941.9 | 2941.1 | 2945 | 2942 |
| 2896 | 2898.2 | 2899 | |||
| 2894.1 | |||||
| ν2 | CH3 antisymmetric stretch | 2881.3 | 2879.9 | 2884 | 2881 |
| 2862.1 | 2863.3 | 2865 | |||
| ν3 | CH3 symmetric stretch | 2791.8 | 2791.9 | 2794 | 2793 |
| ν4 | NH2 def. | 1616.1 | 1625.0 | 1618 | 1651 |
| 1472.8 | |||||
| ν12 | CH3 antisymmetric def. | 1478.6 | 1480.1 | 1479 | 1500 |
| 1610.5 | |||||
| ν5 | CH3 antisymmetric def. | 1455.0 | 1447.8 | ||
| 1463.0 | |||||
| ν6 | CH3 symmetric def. | 1420.3 | 1425.4 | 1421 | 1441 |
| 1422.0 | |||||
| 1416.5 | |||||
| ν13 | CH3 rock/NH2 twist | 1339.1 | 1337.4 | 1339 | 1353 |
| ν7 | CH3 rock | 1159.2 | 1164.3 | 1161 | 1182 |
| ν8 | CN stretch | 1043.3 | 1040.9 | 1045 | 1048 |
| ν14 | CH3 rock/NH2 | 996.8 | 991.7 | 997 | 1005 |
| ν9 | NH2 wag | 903.5 | 948.1 | 931 | 955 |
| 914.8 | |||||
| 909.5 |
References. (a)This work, (b)Oba et al. (2014), (c)Durig et al. (1968).
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