"Raman effect." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/raman-effect>.
Raman effect. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/raman-effect
The alteration of the frequency and the phase of light as it passes through a transparent medium. The Raman effect is caused by small differences between the energy of photons absorbed by the molecules that make up the medium and the energy of photons re-emitted.