OK but I don't know about Hamiltonian and Eigen functions and have never solved a Schrodinger equation. So, with this in mind can you direct me to a first principles text that will prepare me to deal with "Fermi's Golden Rule" knowing that I don't have the above prerequisites but do have some...
How is the absorption coefficient per unit path length determined for excitation sites in a host crystal with an excitation site density of N and a bandgap of the excitation site equal to the photon energy? What I am trying to determine is how many photons will be absorbed for a given length.