Raman Effect: When the light is deflected through the molecule, it scatters with the change in wavelength and frequency.
C.V. Raman received Nobel Prize in 1930 for his discovery known as Raman Effect.
Reference Source:
[1] Wikipedia Contributors. “C. V. Raman.” Wikipedia, Wikimedia Foundation, 10 Nov. 2021, en.wikipedia.org/wiki/C._V._Raman. Accessed 12 Nov. 2021.
[2] The Nobel Prize in Physics 1930. NobelPrize.org. Nobel Prize Outreach AB 2021. Fri. 12 Nov 2021. <https://www.nobelprize.org/prizes/physics/1930/summary/>