Before revision: Mathematical Formulation The general form of the model is given by where is the relative permittivity, is the photon energy (related to the angular frequency by ), is the value of the relative permittivity at infinite energy, is related to the electric susceptibility.
After revision: Mathematical formulation The general form of the model is given by where is the relative permittivity, is the photon energy (related to the angular frequency by ), is the value of the relative permittivity at infinite energy, is related to the electric susceptibility.