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Interplay of Exciton Transfer and Relaxation
Author(s) -
Barvík Ivan,
Macek Jan
Publication year - 2000
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200000088
Subject(s) - exciton , chemistry , relaxation (psychology) , phonon , density matrix , condensed matter physics , transfer (computing) , biexciton , dimer , quantum mechanics , statistical physics , molecular physics , physics , quantum , psychology , social psychology , parallel computing , computer science , organic chemistry
We have contrasted several methods which can be obtained from the Tokuyama‐Mori approach only by serious approximations treating exciton transfer as well as relaxation in the simplest model, namely symmetric molecular dimer. We have solved dynamical equations of motion for the density matrix p of the exciton interacting with a bath. The bath has been simulated by phonons in an infinite linear chain. An exciton‐phonon interaction has been taken as the local, linear and weak one. The exciton transfer runs in microscopic “SLE like” models without (mSLE) and with (mSLEr) relaxation slower and, on the other hand, in the Redfield (RE) model with the secular approximation quicker than in the Tokuyama‐Mori (TM) model. Relaxation between extended states + and ‐ is for models mSLEr and RE quicker than in the TM model.