I did Raman spectrum of dimethyl carbonate ( (H3CO)2C=O ) and got two peaks at 514 and 913 cm-1. The molecule of dimethylcarbonate contains C=O group, CH3 group, OCH3 group and these groups have stretching at 1755, 2970 and 2850 cm-1. So I am really confuced about appeared peaks at 514 and 913 cm-1? Does anyone could help with proper interpretaton?

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