It is often produced by argon-ion or krypton-ion lasers due to their high continous wave power, although tunable dye lasers can also be used. Its resonance version was predicted by Placzek, and when there are two incoming photons colliding with a single molecule, the hyper-type can be observed. The ratio of the number of molecules which can give up energy for a photon to those which can absorb a photon determines the relative intensities of the anti-Stokes and Stokes lines. Used in spectroscopy 
It is often produced by argon-ion or krypton-ion lasers due to their high continous wave power, although tunable dye lasers can also be used. Its resonance version was predicted by Placzek, and when there are two incoming photons colliding with a single molecule, the hyper-type can be observed. The ratio of the number of molecules which can give up energy for a photon to those which can absorb a photon determines the relative intensities of the anti-Stokes and Stokes lines. Used in spectroscopy to determine molecular structure, this is, for ten points, what effect where a scattered photon changes both frequency and phase after a collision, (*) named for an Indian scientist?
It is often produced by argon-ion or krypton-ion lasers due to their high continous wave power, although tunable dye lasers can also be used.
{Raman} effect or {Raman} spectroscopy or {combination scattering }(before *)