Disorder effect, energy transfer

It should be emphasized that the existence of energy transfer modes hypotliesized earlier with the polyad breakdown is completely consistent with the energy transfer being due to non-classical, dynamical tiumelling processes. This is evident from the observation above that the disorder in the FI2O spechnm is attributable to non-classical effects which nonetheless are accompaniments of cte.s/c CT/bifiircations. 

Baumann J. and Fayes M. D. (1986) Excitation Energy Transfer in Disordered Two-Dimensional and Anisotropic Three-Dimensional Systems Effects of Spatial Geometry on Time-Resolved Observables, J. Chem. Phys. 85, 4087-4107. 

In (1), Hq yields the total energy of system in which the molecules and the lattice are excited, yet there are no interactions between molecules and the lattice. The transfer of an electron from site m to site n is given by //j. Polaronic effects, i.e., effects due to the interaction of the electronic excitation and the lattice, are given by H2 and H. hi H2, the energy of the site is reduced by the interaction with the lattice vibration. In H, the lattice vibration alters the transition probability amplitude from site m to n. The term lattice vibration may refer to inter-molecular or intra-molecular vibrations. Static disorder effects are considered in H4, which describes the changes to the site energy or transition probabihty amplitude by variations in the structure of the molecular sohd. 

A prominent and widely appUed model of electron transfer in organic molecules is Marcus theory. It is thoroughly introduced in Section 4.3.1.1 and hence we concentrate here on its applicabiUty to triplet energy transfer supported by recently reported experimental studies of the temperature dependence of the triplet diffu-sivity and of the effect of disorder on triplet transfer in organic molecules. We would also like to refer the interested reader to a recent overview on experimental and theoretical work concerning a unified description of triplet energy transfer by Kohler and Bassler [30]. 

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