82 80- 70 60- 50 40- 30- 20- 10- -0+ 4000 3107.19cm-1 3065.13cm-1 3500 3016.86cm-1 2970.84cm-1 3000 2878.01cm-1 2940.23cm-1 2500 cm-1 2000 1605.69cm-1 1495.81cm-1 1466.52cm-1 1500 1456.12cm-1 1052.63cm-1 1384.06cm-1 1000 500

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