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

机译：J带理论：从Frenkel激子到电荷转移

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摘要

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).
机译：这项评论涉及所谓的J波段（Jelley，Scheibe，1936）形成理论的现状，J波段是由聚次甲基染料的聚集引起的异常狭窄的高强度红移光吸收带。解释J波段物理性质的两种相反方法受到特别关注。在第一个中，旧的基于Frenkel的统计激子模型，染料的特定结构被认为是无关紧要的，并且通过假定快速移动的Frenkel激子的作用是使电子中的准静态无序化来解释J谱带。线性J聚集体中分子的跃迁能（Knapp，1984）。相反，在第二种方法中，染料的特定结构（存在准线性聚次甲基链）非常重要。这种新方法基于电荷转移的新理论。这里对J波段的解释是，沿着J聚集体发色团的基本电荷转移是由附近环境中原子核的混沌重组在电子运动和核运动之间的共振处动态地泵浦的，而只有重组的核运动才发生。弱混沌（Egorov，2001）。

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