Table 3
Some IR band signatures of dopant heteroatoms in a-C:H:X.
| ≈Wavelength | |||
| X | [μm] | Origin | Note |
|
|
|||
| Si | 11.3 | -Si−C- | a |
| 8.0, 12.7 | >Si(CH3)2 | a | |
| 4.4−4.7 | -Si−H | b | |
| O | 5.9 | >C=O carbonyl | b |
| 3.1 | -O−H | b | |
| N | 6.2, 8.0 | ? | a |
| 4.4−4.5 | -C≡N nitryl | c | |
| 4.8 | -N≡C isonitryl | c | |
| 2.9−3.0, 6.3 | >N−H, -NH2 | a | |
| S | 15 | -C−S- | a |
| 8−10 | >C=S | a | |
Notes.(a) Possible confusion with amorphous silicate and/or aromatic hydrocarbon emission and absorption bands. (b) There is currently no evidence for these absorption bands in the diffuse ISM (e.g., Pendleton & Allamandola 2002; Dartois et al. 2005). (c) Bands not present in nitrogen-doped amorphous silicates heated to ≈800 K (Grishko & Duley 2002b).
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