Table 1.
Vibrational frequencies and assumed band strengths used for solid-phase column densities.
| Species | Frequency | A | Integration |
|---|---|---|---|
| (cm−1) | (cm molec−1) | (cm−1) | |
 |
2251; CN st. | 2.2 × 10−18(1,2) | 2267–2231 |
 |
2245; CN st. | 2.8 × 10−18(3,4) | 2279–2232 |
| CH2CHCNb | 2227; CN st. | 4.0 × 10−18(5) | 2231–2216 |
| CH3NCa | 2168; NC st. | 8.4 × 10−18(6) | 2181–2157 |
| CH3CH2NCb | 2155; NC st. | 8.4 × 10−18(6) | 2165–2145 |
| HCNa, b | 2083; CN st. | 1.1 × 10−17(3) | 2100–2071 |
| CH2CNHa | 2034; CCN st. | 7.2 × 10−17(1) | 2070–1990 |
| CH3CHCNHb | 2034; CCN st. | 7.2 × 10−17(1) | 2068–1980 |
| CH4a | 1305; CH def. | 9.7 × 10−18(7) | 1319–1288 |
Notes. * Species marked with an asterisk are the parent ices. a Species formed following energetic processing of CH3CN. b Species formed following energetic processing of CH3CH2CN. (1) Hudson & Moore (2004); (2) Rachid et al. (2022); (3) Gerakines et al. (2021); (4) Moore et al. (2010); (5) Toumi et al. (2016); (6) Hager et al. (2025); (7) Gerakines & Hudson (2015).
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