Studying the spectral diffusion dynamics of chlorophyll a and chlorophyll b using two-dimensional electronic spectroscopy

M.F. Khyasudeen; P.J. Nowakowski; H.L. Nguyen; J.H.N. Sim; T.N. Do; H.-S. Tan

doi:10.1016/j.chemphys.2019.110480

Studying the spectral diffusion dynamics of chlorophyll a and chlorophyll b using two-dimensional electronic spectroscopy

M.F. Khyasudeen, P.J. Nowakowski, H.L. Nguyen, J.H.N. Sim, T.N. Do, H.-S. Tan

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

© 2019 Elsevier B.V.Chlorophyll a (Chl a) and Chlorophyll b (Chl b) are major pigments in the photosynthetic machinery in green plants. Despite their similarities in chemical structures, the relaxation dynamics as observed in the ultrafast methods, such as pump probe and multidimensional spectroscopy, demonstrate a distinct kinetics. Here, we employ the ultrafast two-dimensional electronic spectroscopy (2DES) method to characterize the frequency fluctuation correlation function (FFCF) for Chl a and Chl b in various solvent environments, through the Centre Line Slope (CLS) method. We observe that the FFCF decay for both Chl a and Chl b in the methanol solvent environment has a ~40 ps component that is absent in aprotic solvents, tetrahydrofuran and diethyl ether. We observe also that Chl b exhibit higher values of inhomogeneous broadening than Chl a.

Original language	English
Article number	110480
Journal	Chemical Physics
Volume	527
DOIs	https://doi.org/10.1016/j.chemphys.2019.110480
Publication status	Published - 1 Nov 2019
Externally published	Yes

Funding

This work is supported by grants from the Singapore Ministry of Education Academic Research Fund (Tier 2 MOE2015-T2-1-039 and Tier 1 RG16/15). M.F.K. acknowledges funding from the Ministry of Education Malaysia and the SLAB/SLAI fellowship scheme from the University of Malaya . We thank Zhi-Heng Loh and his research group for material help and advice with the gas filamentation supercontinuum generation.

Funders	Funder number
Singapore Ministry of Education Academic Research Fund	MOE2015-T2-1-039, RG16/15
Ministry of Higher Education, Malaysia
Universiti Malaya

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title = "Studying the spectral diffusion dynamics of chlorophyll a and chlorophyll b using two-dimensional electronic spectroscopy",

abstract = "{\textcopyright} 2019 Elsevier B.V.Chlorophyll a (Chl a) and Chlorophyll b (Chl b) are major pigments in the photosynthetic machinery in green plants. Despite their similarities in chemical structures, the relaxation dynamics as observed in the ultrafast methods, such as pump probe and multidimensional spectroscopy, demonstrate a distinct kinetics. Here, we employ the ultrafast two-dimensional electronic spectroscopy (2DES) method to characterize the frequency fluctuation correlation function (FFCF) for Chl a and Chl b in various solvent environments, through the Centre Line Slope (CLS) method. We observe that the FFCF decay for both Chl a and Chl b in the methanol solvent environment has a ~40 ps component that is absent in aprotic solvents, tetrahydrofuran and diethyl ether. We observe also that Chl b exhibit higher values of inhomogeneous broadening than Chl a.",

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AU - Khyasudeen, M.F.

AU - Nowakowski, P.J.

AU - Nguyen, H.L.

AU - Sim, J.H.N.

AU - Do, T.N.

AU - Tan, H.-S.

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AB - © 2019 Elsevier B.V.Chlorophyll a (Chl a) and Chlorophyll b (Chl b) are major pigments in the photosynthetic machinery in green plants. Despite their similarities in chemical structures, the relaxation dynamics as observed in the ultrafast methods, such as pump probe and multidimensional spectroscopy, demonstrate a distinct kinetics. Here, we employ the ultrafast two-dimensional electronic spectroscopy (2DES) method to characterize the frequency fluctuation correlation function (FFCF) for Chl a and Chl b in various solvent environments, through the Centre Line Slope (CLS) method. We observe that the FFCF decay for both Chl a and Chl b in the methanol solvent environment has a ~40 ps component that is absent in aprotic solvents, tetrahydrofuran and diethyl ether. We observe also that Chl b exhibit higher values of inhomogeneous broadening than Chl a.

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Studying the spectral diffusion dynamics of chlorophyll a and chlorophyll b using two-dimensional electronic spectroscopy

Abstract

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