| Frequencies on ATR-FTIR spectra (cm−1) | Assignment of bonds | Mode of vibration | ||
| CARVACROL |
| |||
| 810 - 807 | C-H out-of-plane | wagging | ||
| 1125 - 1085 | ortho-substitution, | - | ||
| 995 - 990 | 1:2:4-Substituion | - | ||
| 1380, 1360 | isopropyl group | symmetric and asymmetric bending | ||
| 1520 - 1513 | C-H (CH3) | waging | ||
| 1600, 1580, 1500 | C=C | stretching | ||
| 3000 - 2850 | C-H | symmetric and asymmetric stretching | ||
| 3360 - 3330 | -OH | stretching | ||
| THYMOL |
| |||
| 806 - 804 | C-H out-of-plane | waging | ||
| 1045, 1003 | 1:3:4-substitution | - | ||
| 1170 - 1140 | meta-substitution | - | ||
| 1380, 1360 | isopropyl group | symmetric and asymmetric bending | ||
| 1520 - 1513 | C-H (CH3) | waging | ||
| 1600, 1580, 1500 | C=C | stretching | ||
| 3000 - 2850 | C-H | symmetric and asymmetric stretching | ||
| 3360 - 3330 | -OH | stretching | ||
| P-CYMENE |
|
| ||
| 812 - 811 | CH-out-of-plane | waging | ||
| 1055, 1019 | para-substitution | - | ||
| 1380, 1360 | isopropyl group (-CH-CH3CH3) | symmetric and asymmetric bending | ||
| 1515 - 1513 | C-H (CH3) | waging | ||
| 3000 - 2850 | C-H | symmetric and asymmetric stretching | ||