Band 521.5 cm^-1: ν₂ (A₁(TO)) of ³²S¹⁶O₂ in natural SO2 - phase I Band 522.5 cm^-1: ν₂ (A₂?) of ³²S¹⁶O₂ in natural SO2 - phase I Band 532.0 cm^-1: ν₂ (A₁(LO)) of ³²S¹⁶O₂ in natural SO2 - phase I Band 1143.0 cm^-1: ν₁ (A₁(TO)) of ³²S¹⁶O₂ in natural SO2 - phase I Band 1149.0 cm^-1: ν₁ (A₁(LO)) of ³²S¹⁶O₂ in natural SO2 - phase I Band 1310.5 cm^-1: ν₃ (B₁(TO)) of ³²S¹⁶O₂ in natural SO2 - phase I Band 1322.5 cm^-1: ν₃ (B₂(TO)) of ³²S¹⁶O₂ in natural SO2 - phase I Band 1328.0 cm^-1: ν₃ of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 1341.0 cm^-1: ν₃ (B₁(LO)) of ³²S¹⁶O₂ and ν₃ (B₂(LO)) of ³²S¹⁶O₂ in natural SO2 - phase I

Band 516.5 cm^-1: ν₂ of ³³S¹⁶O₂ in natural SO2 - phase I

Band 514.0 cm^-1: ν₂ of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 1140.0 cm^-1: ν₁ of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 1304.3 cm^-1: ν₃ of ³⁴S¹⁶O₂ in natural SO2 - phase I

Band 1134.5 cm^-1: ν₁ of ³²S¹⁶O¹⁷O in natural SO2 - phase I

Band 1120.5 cm^-1: ν₁ of ³²S¹⁶O¹⁸O in natural SO2 - phase I Band 1302.8 cm^-1: ν₃ of ³²S¹⁶O¹⁸O in natural SO2 - phase I

Band 1099.0 cm^-1: ν₁ of ³²S¹⁸O₂ in natural SO2 - phase I Band 1281.0 cm^-1: ν₃ of ³²S¹⁸O₂ in natural SO2 - phase I

Band 1113.0 cm^-1: ν₁ of ³⁴S¹⁶O¹⁸O in natural SO2 - phase I

Band 1288.0 cm^-1: ν₃ of ³⁶S¹⁶O₂ in natural SO2 - phase I

Band 1611.3 cm^-1: ν₁+ν₂ of ³²S¹⁶O₂ in natural SO2 - phase I Band 1850.0 cm^-1: ν₂+ν₃ of ³²S¹⁶O₂ in natural SO2 - phase I Band 2287.5 cm^-1: 2ν₁ of ³²S¹⁶O₂ in natural SO2 - phase I Band 2301.0 cm^-1: 2ν₁+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 2457.0 cm^-1: ν₁+ν₃ of ³²S¹⁶O₂ in natural SO2 - phase I Band 2473.0 cm^-1: ν₁+ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 2516.0 cm^-1: ν₁+ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 2531.0 cm^-1: ν₁+ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 2547.5 cm^-1: ν₁+ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 2628.0 cm^-1: 2ν₃ (B₁(TO))? of ³²S¹⁶O₂ in natural SO2 - phase I Band 2646.5 cm^-1: 2ν₃ (B₂(TO))? of ³²S¹⁶O₂ in natural SO2 - phase I Band 2680.0 cm^-1: 2ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 2725.0 cm^-1: 2ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 2808.5 cm^-1: 2ν₁+ν₂ of ³²S¹⁶O₂ in natural SO2 - phase I Band 2815.0 cm^-1: 2ν₁+ν₂+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 2821.0 cm^-1: 2ν₁+ν₂+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 2976.0 cm^-1: ν₁+ν₂+ν₃ of ³²S¹⁶O₂ in natural SO2 - phase I Band 2987.0 cm^-1: ν₁+ν₂ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 2993.0 cm^-1: ν₁+ν₂ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3004.0 cm^-1: ν₁+ν₂ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3010.5 cm^-1: ν₁+ν₂ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3421.5 cm^-1: 3ν₁ of ³²S¹⁶O₂ in natural SO2 - phase I Band 3428.5 cm^-1: 3ν₁+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3432.0 cm^-1: 3ν₁+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3437.0 cm^-1: 3ν₁+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3440.0 cm^-1: 3ν₁+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3584.2 cm^-1: 2ν₁+ν₃ of ³²S¹⁶O₂ in natural SO2 - phase I Band 3593.0 cm^-1: 2ν₁+ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3600.8 cm^-1: 2ν₁+ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3605.0 cm^-1: 2ν₁+ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3615.5 cm^-1: 2ν₁+ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3756.0 cm^-1: ν₁+2ν₃ of ³²S¹⁶O₂ in natural SO2 - phase I Band 3761.5 cm^-1: ν₁+2ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3781.0 cm^-1: ν₁+2ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3791.5 cm^-1: ν₁+2ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3805.0 cm^-1: ν₁+2ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3936.3 cm^-1: 3ν₃ of ³²S¹⁶O₂ in natural SO2 - phase I Band 3943.0 cm^-1: 3ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 3957.3 cm^-1: 3ν₃+ν_L,T of ³²S¹⁶O₂ in natural SO2 - phase I Band 4101.5 cm^-1: 2ν₁+ν₂+ν₃ of ³²S¹⁶O₂ in natural SO2 - phase I Band 4547.5 cm^-1: 4ν₁ of ³²S¹⁶O₂ in natural SO2 - phase I Band 4704.0 cm^-1: 3ν₁+ν₃ of ³²S¹⁶O₂ in natural SO2 - phase I Band 5046.8 cm^-1: ν₁+3ν₃ of ³²S¹⁶O₂ in natural SO2 - phase I

Band 2281.0 cm^-1: 2ν₁ of ³³S¹⁶O₂ in natural SO2 - phase I Band 2445.3 cm^-1: ν₁+ν₃ of ³³S¹⁶O₂ in natural SO2 - phase I Band 2799.3 cm^-1: 2ν₁+ν₂ of ³³S¹⁶O₂ in natural SO2 - phase I Band 2962.5 cm^-1: ν₁+ν₂+ν₃ of ³³S¹⁶O₂ in natural SO2 - phase I Band 3410.5 cm^-1: 3ν₁ of ³³S¹⁶O₂ in natural SO2 - phase I Band 3569.0 cm^-1: 2ν₁+ν₃ of ³³S¹⁶O₂ in natural SO2 - phase I Band 3913.0 cm^-1: 3ν₃ of ³³S¹⁶O₂ in natural SO2 - phase I

Band 2273.8 cm^-1: 2ν₁ of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 2434.5 cm^-1: ν₁+ν₃ of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 2602.7 cm^-1: 2ν₃? of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 2790.5 cm^-1: 2ν₁+ν₂ of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 2950.0 cm^-1: ν₁+ν₂+ν₃ of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 3399.8 cm^-1: 3ν₁ of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 3554.0 cm^-1: 2ν₁+ν₃ of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 3890.5 cm^-1: 3ν₃ of ³⁴S¹⁶O₂ in natural SO2 - phase I Band 4993.0 cm^-1: ν₁+3ν₃ of ³⁴S¹⁶O₂ in natural SO2 - phase I

Band 2261.0 cm^-1: 2ν₁ of ³²S¹⁶O¹⁷O in natural SO2 - phase I

Band 2244.8 cm^-1: 2ν₁ of ³⁴S¹⁶O¹⁷O in natural SO2 - phase I

Band 2233.5 cm^-1: 2ν₁ of ³²S¹⁶O¹⁸O in natural SO2 - phase I Band 2413.0 cm^-1: ν₁+ν₃ of ³²S¹⁶O¹⁸O in natural SO2 - phase I Band 2598.5 cm^-1: 2ν₃? of ³²S¹⁶O¹⁸O in natural SO2 - phase I Band 2744.0 cm^-1: 2ν₁+ν₂ of ³²S¹⁶O¹⁸O in natural SO2 - phase I Band 3514.0 cm^-1: 2ν₁+ν₃ of ³²S¹⁶O¹⁸O in natural SO2 - phase I Band 3883.0 cm^-1: 3ν₃ of ³²S¹⁶O¹⁸O in natural SO2 - phase I

Band 2217.5 cm^-1: 2ν₁ of ³⁴S¹⁶O¹⁸O in natural SO2 - phase I