| No | Wave number range (cm−1) | Functional groups |
| 1 | Near 500 (intensive) | -C-I |
| 2 | Near 690 | -CH=CH-(cis-) |
| 3 | 890 - 820 (extremely weak) | Alkyl peroxide |
| 4 | 970 - 960 (intensive) | -CH=CH-(trans-) |
| 5 | 1150 - 1060 (extremely intensive) | Alkyl ethers |
| 6 | 1220 - 1150 | Alkane sulfonate |
| 7 | Near 1250 (intensive) | Cyclic ethers (epoxy compound) |
| 8 | 1420 - 1330 (intensive) 1610 - 1550 (intensive) | -COO- |
| 9 | 1660 - 1480 (variable) | Ring-like conjugated compound |
| 10 | 1667 - 833 | acylamino |
| 11 | 1685 - 1665 | -CH=CH-CO- |
| 12 | 2640 - 1630 | COOH oscillation in acylamino acid |
| 13 | 2700 - 2560 (wide and low) | P-OH |
| 14 | 3300 - 3030 (extremely intesive), 1430 - 1390 (intensive) | Ammonium salt |