Table 2
Vibrational band assignments measured in the absorption spectra of samples 1 to 3.
| Assignment | Sample 1 | Sample 2 | Sample 3 | ||||||
|
λ | Int |
|
λ | Int |
|
λ | Int | |
|
|
|||||||||
| sp alkyne ≡ CH str. | 3290 | 3.040 | m | w | w | ||||
| sp2 asym. = CH2 str. | 3089 | 3.237 | m | w | w | ||||
| sp2 aromatic CH str. | 3040 | 3.289 | s | m | w | ||||
| sp3 asym. -CH3 str. | 2958 | 3.381 | w | m | m | ||||
| sp3 asym. -CH2 | 2924 | 3.420 | w | m | m | ||||
| sp3 -CH str. or -CH2 Fermi resonance | 2894 | 3.455 | w | w | w | ||||
| sp3 sym. -CH3 str. | 2870 | 3.484 | w | w | w | ||||
| sp3 sym. -CH2 str. | 2852 | 3.506 | w | w | m | ||||
| sp3 -CH str. on diamond-like carbon | 2830 | 3.534 | w | – | – | – | – | – | – |
| Combination band | 1900 | 5.263 | w | – | – | – | – | – | – |
| Combination band | 1770 | 5.650 | w | – | – | – | – | – | – |
| Carbonyl -C=O | 1718 | 5.821 | w | w | m | ||||
| sp2 aromatic C=C str. | 1611 | 6.207 | s | 1590 | 6.289 | s | 1585 | 6.309 | s |
| sp3 -CH2,3 bend. or sp2 aromatic C=C str. | 1444 | 6.925 | s | w | w | ||||
| sp3 -CH3 bend. or sp2 aromatic C=C str. | 1377 | 7.262 | s | w | w | ||||
| sp3-like C-C str. of defects | – | – | – | 1260 | 7.937 | s | 1250 | 8.000 | s |
| sp2 aromatic CH in plane bend. | 1160 | 8.621 | m | m | w | ||||
| non attributed | 1084 | 9.225 | m | – | – | – | – | – | – |
| sp2 aromatic CH out plane bend. (solo) | 884 | 11.31 | s | s | m | ||||
| sp2 aromatic CH out plane bend. (duo) | 841 | 11.89 | m | m | w | ||||
| sp2 aromatic CH out plane bend. (quartet) | 759 | 13.18 | m | w | w | ||||
Notes. Positions are given in wavenumber (cm-1) and in wavelength (μm), and relative intensities (s: strong; m: medium; w: weak) are also listed. The uncertainty of the positions is 5 cm-1. When the vibrational bands were clearly of different nature between samples, these were listed separately. Bend is used for bending motions, str means stretching mode, and “–” means no band is observed. See text for details.
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