Abstract
A large number of complex experimental cases are considered which in recent years have been studied with the aid of the admittedly simplified apparatus of the Holstein theory. The fundamental Holstein equation is derived, starting with a system of coupled Boltzmann equations for the photons and the density of excited states. The derivation process provides opportunities for obtaining some intermediate kinetic equations with broader ranges of applicability than the Holstein equation. Some remarks are made concerning the combined transport in space of photons and excited atoms.
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