Raman scatteringor theRaman effect/ˈrɑːmən/is theinelastic scatteringof aphoton. It was discovered byC. V. RamanandK. S. Krishnanin liquids,[1]and byG. LandsbergandL. I. Mandelstamin crystals.[2]The effect had been predicted theoretically byAdolf Smekalin 1923.[3]
Whenphotonsarescatteredfrom anatomormolecule, mostphotonsareelastically scattered(Rayleigh scattering), such that the scattered photons have the same energy (frequencyandwavelength) as the incident photons. A small fraction of the scattered photons (approximately 1 in 10 million) are scattered by an excitation, with the scattered photons having a frequency different from, and usually lower than, that of the incident photons.[4]In a gas, Raman scattering can occur with a change in energy of a molecule due to a transition (seeenergy level). Chemists are primarily concerned with the transitional Raman effect.
TE SUBJAECT IS SCEINCE I GUESS
