Table 2 Positions of peaks in infrared spectra and corresponding vibration types

From: Characterization of a 13th-century Tibetan birch bark manuscripts: investigating utilization and craftmanship

Wave number(cm−1)

Assignment

Reference

3286

O–H stretching of aromatic and aliphatic compounds

 

2917

Asym. CH2 stretching

 

2844

Sym. CH2 stretching

 

1734

C=O stretching vibration in acetyl groups

45

1640

Adsorbed H2O

46

1425-1560

Aromatic skeletal vibrations

47,48

1252(peak in literature: 1266-1270)

G ring plus C=O stretching

45,46

1165(peak in literature: 1160)

Aromatic C–H in plane deformation; typical for G units

45,46

1005

C-O stretching of carbohydrate

 

912

Asym. out-of-phase ring stretching

46

<900

Out of plane CH2 deformation

 
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