C. Bacchiocchi, C. Zannoni, Energy Transfer in condensed systems.
The effect of phase organization, Chem.Phys.Lett., 268, 541-548
(1997)
We investigate the effects that a phase transformation,
from isotropic to orientationally (nematic) and positionally (smectic)
ordered mesophases, has on the energy transfer process between solute molecules.
We combine Metropolis Monte Carlo simulations and a master equation approach
to study radiationless energy transfer processes in three dimensional ordered
systems of identical uniaxial particles interacting via the Gay-Berne potential.
The time dependent excitation probability and the fluorescence anisotropy
decay curves show an enhanced energy transfer in systems with a higher
degree of order. We also find a non isotropic evolution of the time dependent
excitation probability in systems with positional as well as orientational
order, with a faster energy transfer in the smectic planes.