One type of this process 
One type of this process is the basis for a kind of spectroscopy and has Stokes and anti-Stokes varieties. In addition to the Raman kind of this phenomenon, one inelastic type causes the wavelengths of x-rays and gamma rays to decrease. An elastic type caused by particles in the air makes the sky appear blue. For 10 points, name this phenomenon with varieties named for Compton and Rayleigh, in which radiation deviates from a straight trajectory.
One type of this process is the basis for a kind of spectroscopy and has Stokes and anti-Stokes varieties.
{scattering}