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Raman Spectra Identification
Overview of the key components of Raman spectra
Each Raman spectrum is made up of a series of Raman peaks, with each peak representing the vibrational, rotational, or other low-frequency modes of the excited molecule. Each spectral band reflects a specific amount of energy lost or gained by scattered photons, creating a unique chemical fingerprint that is the basis for Raman identification.
The RAMAN SPECTRUM is often considered to consist of distinct regions:
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Low-frequency region (< 200 cm-1), showing lattice motions of molecules in a crystal; -
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Fingerprint region (200–1800 cm-1), showing extended skeleton motions of the molecule; -
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Functional group region (> 1800 cm-1), showing local motions characteristic of functional groups, often sub-divided into the: