Is Raman spectroscopy qualitative or quantitative?

Raman spectroscopy is both qualitative and quantitative.

The general spectrum profile (peak position and relative peak intensity) provides a unique chemical fingerprint which can be used to identify a material, and distinguish it from others.  Often the actual spectrum is quite complex, so comprehensive Raman spectral libraries can be searched to find a match, and thus provide a chemical identification.

The intensity of a spectrum is directly proportional to concentration – typically a calibration procedure will be used to determine the relationship between peak intensity and concentration, and then routine measurements can be made to analyse for concentration.  With mixtures, relative peak intensities provide information about the relative concentration of the components, whilst absolute peak intensities can be use for absolute concentration information.

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