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The anisotropy of fluorescence in ring units
Authors:Michal Reiter  Pavel He&#x;man  Ivan Barvík
Institution:

aInstitute of Physics of Charles University, Faculty of Mathematics and Physics, CZ-12116 Prague, Czech Republic

bDepartment of Physics, University of Hradec Králové, V. Nejedlého 573, CZ-50003 Hradec Králové, Czech Republic

Abstract:The time dependence of the anisotropy of fluorescence after an impulsive excitation in the ring unit (resembling the B850 ring of the purple bacterium Rhodopseudomonas acidophila) is calculated. Fast fluctuations of the environment are simulated by dynamic disorder and slow fluctuations by static disorder. Both types of disorder are taken into account simultaneously. Without dynamic disorder modest degrees of static disorder are sufficient to cause the experimentally found initial drop of the anisotropy on a sub-100 fs time scale. Two different models of the spectral density J(ω) of phonons have been often used in the literature to describe influence of the bath. The spectral density J(ω) enters the non-Markovian dynamical equations for the one exciton density matrix (entering the time dependence of the anisotropy of fluorescence). The spectral density J(ω) with high-energy tail leads to faster anisotropy decay.
Keywords:Exciton transfer  Density matrix theory  Fluorescence
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