Singlet and triplet excited states dynamics of photosynthetic pigment chlorophyll a investigated by sub-nanosecond pump-probe spectroscopy

Kosumi, D., Nishiguchi, T., Amao, Y., Cogdell, R.J. and Hashimoto, H. (2018) Singlet and triplet excited states dynamics of photosynthetic pigment chlorophyll a investigated by sub-nanosecond pump-probe spectroscopy. Journal of Photochemistry and Photobiology A: Chemistry, 358, pp. 374-378. (doi:10.1016/j.jphotochem.2017.09.046)

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Abstract

Singlet and triplet excited states dynamics of the photosynthetic pigment chlorophyll a in various solvents have been investigated by sub-ns pump-probe spectroscopic measurements with a sub-ns time resolution and a temporal window up to 400 μs. The singlet and triplet lifetimes of chlorophyll a were determined respectively to be 5.2–7.0 ns and 1.2–12 μs, depending on solvents. On a basis of a global analysis of time-resolved spectroscopic data, we estimated an yield of the intersystem crossing from the singlet to triplet excited states chlorophyll a to be about 30% depending not on surrounding environments. The value is much lower than the previously reported values.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cogdell, Professor Richard
Authors: Kosumi, D., Nishiguchi, T., Amao, Y., Cogdell, R.J., and Hashimoto, H.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Journal of Photochemistry and Photobiology A: Chemistry
Publisher:Elsevier
ISSN:1010-6030
ISSN (Online):1873-2666
Published Online:28 September 2017

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