| Wave numbers (cm−1) | Assignment | Polymer | References |
| 875 | Glycosidic linkage | Hemicellulose | [26] |
| 930 | Glycosidic linkage | Cellulose, Hemicellulose, Lignin | |
| 990 | C-O valence vibration | Cellulose | |
| 1035 | C-O, C = C, C-C-O vibrational stretching | Cellulose, Hemicellulose, Lignin | |
| 1160 | C-O-C asymmetrical stretching | Cellulose, Hemicellulose | |
| 1215 | C-C + C-O stretching | Lignin | [33] |
| 1327 | C-O of syringyl ring | Lignin | |
| 1335 | C-H bending, O-H in-plane bending | Cellulose, Hemicellulose, Lignin | |
| 1380 | C-H bending | Cellulose, Hemicellulose, Lignin | |
| 1440 | O-H in-plane bending | Cellulose, Hemicellulose, Lignin | [35] |
| 1595 | Aromatic ring C = C vibration | Lignin | |
| 3343 | -OH stretching | Cellulose, Hemicellulose, Lignin |