S/N

Wave number (cm⁻¹)

Functional group

1

480.28

${\text{SO}}_4^{-}$ (silicate))

2

617.22

${\text{SO}}_3^{2-}$ (sulfite ions), 1-nitropyrene

3

1091.7

${\text{SO}}_4^{2-}$ ${\text{HSO}}_4^{-}$ (sulphate, bisulphate)

4

1425.4

NH4⁺ (ammonium)

5

1616.35

Aerosol salt

6

2858.51

CH₃, CH₂ and CH alkanes

7

2924.09

Aliphatic hydrocarbon

8

3429.43

Alcohol, phenol

9

3699.47

OH⁻

10

3770.84

C=O, OH⁻