Summary
We present a molecular theory of the energy distributions for the internal quantum states of a solute in a liquid or glassy solvent. We show that the energy distributions for different states are correlated in a way that depends on the solute-solvent interactions. We show how the theory can be modified easily to describe the transition-energy distributions for different pairs of states, which are of course related to inhomogeneously broadened absorption spectra. We also show that the distributions for different transitions are correlated, and describe how this correlation is measured by nonresonant fluorescence- and phosphorescence-line-narrowing and hole-burning experiments. The theory provides a microscopic framework within which to interpret different phenomenological models. For the case of a Lennard-Jones solute in a Lennard-Jones liquid solvent, we compare our theory to Monte Carlo simulation.
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Sevian, H.M., Skinner, J.L. A molecular theory of inhomogeneous broadening, including the correlation between different transitions, in liquids and glasses. Theoret. Chim. Acta 82, 29–46 (1992). https://doi.org/10.1007/BF01113128
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DOI: https://doi.org/10.1007/BF01113128