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- W2059497033 endingPage "326" @default.
- W2059497033 startingPage "223" @default.
- W2059497033 abstract "This review concerns the current status of the theory of formation of the so-called J-band (Jelley, Scheibe, 1936), an abnormally narrow, high-intensity, red-shifted optical absorption band arising from the aggregation of polymethine dyes. Two opposite approaches to explaining the physical nature of the J-band are given special attention. In the first of these, the old one based on Frenkel’s statistical exciton model, the specific structure of the dye is considered irrelevant, and the J-band is explained by assuming that the quickly moving Frenkel exciton acts to average out the quasistatic disorder in electronic transition energies of molecules in the linear J-aggregate (Knapp, 1984). In the second approach, on the contrary, the specific structure of the dye (the existence of a quasilinear polymethine chain) is supposed to be very important. This new approach is based on a new theory of charge transfer. The explanation of the J-band here is that an elementary charge transfer along the J-aggregate’s chromophore is dynamically pumped by the chaotic reorganization of nuclei in the nearby environment at a resonance between electronic and nuclear movements—when the motion of nuclei being reorganized is only weakly chaotic (Egorov, 2001)." @default.
- W2059497033 created "2016-06-24" @default.
- W2059497033 creator A5035525644 @default.
- W2059497033 date "2009-08-01" @default.
- W2059497033 modified "2023-10-14" @default.
- W2059497033 title "Theory of the J-band: From the Frenkel exciton to charge transfer" @default.
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