SIMULATED TIME-RESOLVED FLUORESCENCE IN ORDERED PHASES

An interpretation of time resolved fluorescence emission experiments, performed on probes in isotropic and order polar phases, is developed. The system under scrutiny is provided by a dipolar molecule undergoin g rotational diffusion, whose dipole moment is coupled to a stochastic reaction field generated by the ordered polar medium. Under quite gen eral conditions, the fluorescence emission is defined as an integral o ver all possible orientations of the ground and excited states. Since the model allows to reproduce experimental results at a semi-quantitat ive level and a negligible computational cost, a user-friendly package with graphics utilities has been created, which can be of help to inv estigate interactively the dependence of the simulated spectra upon se veral macroscopical parameters such as the dielectric constants and th e viscosity of the medium.