Table 2
Adopted C-H and C-C band modes in eRCN bulk materials: band centre (ν0), width (δ) and integrated cross-section (σ).
| ν 0 | δ | σ | Band | eRCN | ||
| No. | [cm-1 (μm)] | [cm-1] | [× 10-18 cm2] | assignment | designation | Notes |
|
|
||||||
| C-H stretching modes | ||||||
| 1 | 3078 (3.25) | 22.5 | 1.40 | sp2 CH2 olefinic, asy. | X |
|
| 2 | 3050 (3.28) | 53.1 | 1.50 | sp2 CH aromatic | X |
|
| 3 | 3010 (3.32) | 47.1 | 2.50 | sp2 CH olefinic | X |
|
| 4 | 2985 (3.35) | 17.7 | 1.15 | sp2 CH2 olefinic, sym. | X |
|
| 5 | 2960 (3.38) | 29.3 | 5.00 | sp3 CH3 aliphatic, asy. | φ X |
|
| 6 | 2925 (3.42) | 28.9 | 3.30 | sp3 CH2 aliphatic, asy. | X |
|
| 7 | 2900 (3.45) | 30.0 | 0.50 | sp3 CH2 aliphatic | X |
|
| 8 | 2882 (3.47) | 30.2 | 1.00 | sp3 CH tertiary aliphatic | X |
|
| 9 | 2871 (3.48) | 27.8 | 1.45 | sp3 CH3 aliphatic, sym. | φ X |
|
| 10 | 2850 (3.51) | 41.8 | 2.20 | sp3 CH2 aliphatic, sym. | X |
|
| C-H bending modes | ||||||
| 11 | 1470 (6.80) | 30.0 | 0.30 | sp3 CH3 aliphatic, asy. | φ X |
est. width |
| 12 | 1450 (6.90) | 30.0 | 1.20 | sp3 CH2 aliphatic | X |
est. width |
| 13 | 1430 (6.99) | 30.0 | 0.10 | sp2 CH aromatic | X |
est. width |
| 14 | 1410 (7.09) | 30.0 | 1.00 | sp2 CH2 olefinic | X |
est. width |
| 15 | 1400 (7.14) | 30.0 | 0.10 | sp3 (CH3)3 aliphatic, sym. | X |
not included |
| 16 | 1370 (7.30) | 30.0 | 0.30 | sp3 CH3 aliphatic, sym. | φ X |
est. width |
| C-C modes | ||||||
| 17 | 1600 (6.25) | 40.0 | 0.19 | sp2 C ≃ C aromatic | XC≃C | est. width |
| 18 | 1500 (6.67) | 40.0 | 0.15 | sp2 C ≃ C aromatic | XC≃C | est. width |
| 19 | 1640 (6.10) | 40.0 | 0.10 | sp2 C=C olefinic | XC=C | all data est. |
| additionally-assumed and estimated C-H modes | ||||||
| 20 | 3020 (3.31) | 50.0 | 0.50 | sp2 CH olefinic | X |
est. intensity and width |
| 21 | 890 (11.24) | 20.0 | 0.50 | sp2 CH aromatic | X |
est. intensity and width |
| 22 | 880 (11.36) | 40.0 | 0.50 | sp2 CH aromatic | X |
est. intensity and width |
| 23 | 790 (12.66) | 50.0 | 0.50 | sp2 CH aromatic | X |
est. intensity and width |
| additionally-assumed and estimated C-C modes | ||||||
| 24 | 1328 (7.53) | 120.0 | 0.10 | sp3 C-C aliphatic | X |
est. intensity and width |
| 25 | 1300 (7.69) | 120.0 | 0.10 | sp3 C-C aliphatic | X |
est. intensity and width |
| 26 | 1274 (7.85) | 120.0 | 0.10 | sp3 C-C aliphatic | X |
est. intensity and width |
| 27 | 1163 (8.60) | 90.0 | 0.10 | sp3 C-C aliphatic | X |
est. intensity and width |
Notes. The data, except where indicated as estimated (est.), are taken from Dartois et al. (2004a,b); Joblin et al. (1994); Ristein et al. (1998); Wexler (1967) and E. Dartois private communication. sym. and asy. indicate symmetric and asymmetric modes, respectively. The 3.47 μm band is estimated from Mennella (2008) and assumed to be similar to the CH2 group properties. The 3.38 μm CH3 band intensity has been scaled up by a factor of 1.4, with respect to the expected value, in order to get a better fit to the the Galactic Centre data (Figs. 8 and 10). Data for the additionally-assumed bands are taken from Robertson (1986) and Verstraete et al. (2001); here we have assumed cross-sections of 5 × 10-19 cm2 and 10-19 cm2 for all CH and CC modes, respectively.
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