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Table 1
IR band strength of amorphous CH3CN ice at 15 K derived in this work.
| Peak position (cm−1) | Integrated region (cm−1) | Assignment(*) | A | A(**) |
|---|---|---|---|---|
| (10−18 cmmolecule−1) | ||||
| 3001.7 | 3030–2975 | CH3 antisymmetric stretching | 1.5 ± 0.2 | 1.5 |
| 2940.9 | 2955–2923 | CH3 symmetric stretching | 0.53 ± 0.08 | 0.47 |
| 2289.0 | 2310–2270 | Combination of modes | 0.62 ± 0.09 | 2.3 |
| 2252.2 | 2265–2235 | CN stretching | 1.9 ± 0.3 | |
| 1448.3 | 1490–1435 | Combination of modes | 2.9 ± 0.4 | 2.2 |
| 1410.0 | 1434–1398.5 | CH3 antisymmetric def. | 1.9 ± 0.3 | 1.4 |
| 1374.5 | 1395–1357 | CH3 symmetric def. | 1.2 ± 0.2 | 1.0 |
| 1041.6 | 1100–1025 | CH3 rock | 1.6 ± 0.2 | 1.3 |
| 919.6 | 940–913.5 | C–C stretching | 0.35 ± 0.05 | 0.2 |
Notes.(*) Band assignments following Milligan & Jacox (1962); Dello Russo & Khanna (1996), and references therein.(**) Values from d'Hendecourt & Allamandola (1986). Estimated uncertainties are around 20%.
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