Hello Im having 2 questions I'm investigating NIR light propagation in tissue such as the skin and my question is: In dipole aprox: Absorption, emission and normal Raman scattering is one-photon processes. But what is Rayleigh scattering? When light hit a small molecule the dipole approximation is good. But what if the single molecule is large like a protein. What happens then to the absorption/emission/raman transitionprobability (fermis golden rule, Kramer-Heisenberg disp relation)?