FTIR vibrations

why on ftir graph there are several peaks for the same compound but at different wavelengths?
what causes the different modes of vibration for the same compound (PO4), what causes the v1 ,v3,v4 for PO4... help me please:frown:
upload_2017-4-14_12-59-58.png
 

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Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
 
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An IR spectrum is a molecule's fingerprint. Every unique compound will have its own IR spectrum. The various peaks depend on the individual bonds in the molecule. Then subdivide the number of unique bonds into stretching modes, symmetric stretching, asymmetric stretching, rocking, wagging, etc. Even simple molecules can have busy IR spectra.
 

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