While most scattered radiation is the same as the incident frequency, some will be above and below, known as anti-Stokes and Stokes radiation, respectively.  
A laser source is used in this effect's namesake spectroscopy, which is used for investigating the vibrational and rotational energy levels of molecules.  While most scattered radiation is the same as the incident frequency, some will be above and below, known as anti-Stokes and Stokes radiation, respectively.  Scattering results from the inelastic collision of photons and molecules after a beam of monochromatic light is passed through a transparent substance.  FTP, identify this effect that describes the scattering of light and UV radiation named after an Indian physicist.
A laser source is used in this effect's namesake spectroscopy, which is used for investigating the vibrational and rotational energy levels of molecules.  
Raman effect