Time-resolved fluorescence anisotropy in degenerate two-state systems: the role of complex stochastic processes

We examine the Haken-Reineker-Strobl model of relaxation processes for a class of two-site systems. We permit the stochastic processes used to simulate reservoir noise in the model to be complex Hermitean, instead of purely real. We demonstrate in a specific case that this can open the possibility of identifying the precise meaning of the decay rate constants obtained from fluorescence anisotropy measurements.