Stated the quantum theory of light?

Oddly enough the first one was Albert Einstein. His nobel prize was for this work not his already published theory of relativity (because it was too weird) he later rejected the current form of...

Einstein proposed that light was made of quanta. He used the proposition to explain the photoelectric effect.

Quantum theory is much more general than atomic theory. Atomic theory was developed to explain the characteristics of chemical reactions and describes atoms as discrete, indivisible units, with...

Light comes in discrete packets called photons. Each photon has energy E = h*frequency. h is called Planck's constant and is ~6.626e-34 Js

Yes, Raman effect or, more usually, Raman scattering, is indeed supported by the quantum theory of light. Raman scattering is the inelastic scattering of light (photons) off matter, and it is...