Raman spectroscopy 

https://doi.org/10.1351/goldbook.08669
Measurement principle of vibrational spectroscopy based on Raman scattering.
Note:
Raman scattered light occurs at wavelengths that are shifted from the incident light by the energies of molecular vibrations.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 761 [Terms] [Paper]