Table 2
Apparent IR band strengths (and their peak positions, assignments, and corresponding integrated regions) of the IR bands of amorphous NH2CHO ice at 15 K derived in this work.
| Peak positions | Integrated region | Assignment(*) | A′ | A′(**) |
|---|---|---|---|---|
| (cm−1 | μm) | (cm−1) | (10−17 cm molec−1) | ||
| 3371.2 | 2.966 | 3719–2980 | NH2 antisymm. stretch (vas NH2) | 15.6 ± 2 | 13.49 |
| 3176.4 | 3.148 | NH2 symm. stretch (vs NH2) | |||
| 2881.9 | 3.470 | 2980–2842 | CH stretch (v CH) | 0.56 ± 0.08 | 0.47 |
| 2797.7 | 3.574 | 2842–2600 | CH bend overtone (2δ CH) | 0.23 ± 0.03 | – |
| 1700.3 | 5.881 | 2050–1532 | C = O stretch (v CO) | 6.4 ± 0.9(***) | 6.54 |
| 1630.4 | 6.133 | NH2 scissor (δ NH2) | |||
| 1388.1 | 7.204 | 1532–1364 | CH bend (δ CH) | 0.9 ± 0.1(***) | 0.68 |
| 1328.1 | 7.529 | 1364–1258 | CN stretch (v CN) | 0.8 ± 0.1(***) | 0.85 |
| 1108.1 | 9.024 | 1174–1030 | NH2 rock (ρ NH2) | 0.23 ± 0.03 | – |
| 1056.1 | 9.469 | CH out-of-plane def. (γ CH) | |||
| 689.2 | 14.510 | 1030–575 | NH2 wag (ω NH2) | 2.3 ± 0.4 | – |
| 634.0 | 15.773 | NH2 twist (2τ NH2) | |||
Notes.(*) Band assignments made according to the works of Räsänen (1983); Kwiatkowski & Leszczyński (1993); Torrie & Brown (1994); Lundell et al. (1998). Some band strengths contain multiple absorption modes in their corresponding integrated regions.(**) Values from Brucato et al. (2006).(***) Bands that are also characterized in mixtures in this work.
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