Singlet-triplet Fission of Carotenoid Excitation in the Purple Phototrophic Bacteria Thermochromatium tepidum

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Abstract

Singlet fission of carotenoid excitation is studied in purple phototrophic bacterium Thermochromatium tepidum. Using time-resolved EPR and magnetic field-induced modulation of fluorescence yield it is shown that the concept of intramolecular excitation fission developed in a number of publications is not supported by the experimental results. The obtained data favor intermolecular fission mechanism involving two carotenoid molecules.

About the authors

I. B. Klenina

IBBP RAS

Email: pros@issp.serpukhov.su
Russian Federation, Pushchino, Moscow oblast, 142290

A. A. Gryaznov

IBBP RAS

Email: pros@issp.serpukhov.su
Russian Federation, Pushchino, Moscow oblast, 142290

Z. K. Makhneva

IBBP RAS

Email: pros@issp.serpukhov.su
Russian Federation, Pushchino, Moscow oblast, 142290

I. I. Proskuryakov

IBBP RAS

Author for correspondence.
Email: pros@issp.serpukhov.su
Russian Federation, Pushchino, Moscow oblast, 142290

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