Abstract
Expressions for time-dependent level populations in four- and five-level molecular models are obtained for the case of radiative and nonradiative decay from an initially populated state corresponding to the highest energy of the molecule. The two lowest energy levels in the models are assigned to vibrational levels of a molecular subsystem in the ground state; the others, to levels of the molecule in the excited electronic state. Examples of applying the obtained expressions to establish the formation mechanism for dual fluorescence pulses that accompany the phototransfer of a H-bond proton and other conformational transformations of molecules are presented.
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