spectroscopic technique used to observe vibrational, rotational, and other low-frequency modes in a system
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Energy-level diagram showing the states involved in Raman spectra.
Raman spectroscopy (/ˈrɑːmən/; named after physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which molecules can be identified.
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