Issues

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2007

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October

  

Reviews of topical problems


Theory of the J-band: from the Frenkel exciton to charge transfer

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Photochemistry Center, Russian Academy of Sciences, Novatorov str. 7a, Moscow, 117421, Russian Federation

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).

Text can be downloaded in Russian. English translation is available on IOP Science.
PACS: 05.10.Ln, 33.20.Kf, 34.70.+e, 71.35.−y, 78.40.Me, 82.20.−w (all)
DOI: 10.1070/PU2007v050n10ABEH006317
URL: https://ufn.ru/en/articles/2007/10/a/
Citation: Egorov V V, Alfimov M V "Theory of the J-band: from the Frenkel exciton to charge transfer" Phys. Usp. 50 985–1029 (2007)
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Оригинал: Егоров В В, Алфимов М В «Теория J-полосы: от экситона Френкеля к переносу заряда» УФН 177 1033–1081 (2007); DOI: 10.3367/UFNr.0177.200710a.1033

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