Abstract

Abstract— Flash photolysis studies of dimeric and monomeric chlorophyll a were carried out at 77 K. The triplet‐triplet absorption spectrum of the dimeric chlorophyll a in 3‐methylpentane at 77 K is interpreted as a sum of the spectra of chlorophyll a in the ground and triplet states. The dimeric chlorophyll a in the triplet state is considered to have the half‐excited structure at 77 K without photodisaggregation owing to high viscosity of the solvent.

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