Comparative Absorption Dynamics of the Singlet Excited States of Chlorophylls a and d.

Autor:	Cherepanov DA; N. N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, 119991, Russia. tscherepanov@gmail.com.; A. N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia., Petrova AA; A. N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia., Mamedov MD; A. N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia., Vishnevskaya AI; A. N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia., Gostev FE; N. N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, 119991, Russia., Shelaev IV; N. N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, 119991, Russia.; A. N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia., Aybush AV; N. N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, 119991, Russia., Nadtochenko VA; N. N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, 119991, Russia.; Faculty of Chemistry, Lomonosov Moscow State University, Moscow, 119991, Russia.
Jazyk:	angličtina
Zdroj:	Biochemistry. Biokhimiia [Biochemistry (Mosc)] 2022 Oct; Vol. 87 (10), pp. 1179-1186.
DOI:	10.1134/S000629792210011X
Abstrakt:	Transient absorption dynamics of chlorophylls a and d dissolved in tetrahydrofuran was measured by the broadband femtosecond laser pump-probe spectroscopy in a spectral range from 400 to 870 nm. The absorption spectra of the excited S 1 singlet states of chlorophylls a and d were recorded, and the dynamics of the of the Q y band shift of the stimulated emission (Stokes shift of fluorescence) was determined in a time range from 60 fs to 4 ps. The kinetics of the intramolecular conversion Q x →Q y (electronic transition S 2 →S 1 ) was measured; the characteristic relaxation time was 54 ± 3 and 45 ± 9 fs for chlorophylls a and d, respectively.
Databáze:	MEDLINE
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