Energy transfer pathways in light-harvesting complexes of purple bacteria as revealed by global kinetic analysis of two-dimensional transient spectra

Evgeny E. Ostroumov; Rachel M. Mulvaney; Jessica M. Anna; Richard J. Cogdell; Gregory D. Scholes

doi:10.1021/jp403028x

Energy transfer pathways in light-harvesting complexes of purple bacteria as revealed by global kinetic analysis of two-dimensional transient spectra

Evgeny E. Ostroumov, Rachel M. Mulvaney, Jessica M. Anna, Richard J. Cogdell, Gregory D. Scholes

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

Excited state dynamics in LH2 complexes of two purple bacterial species were studied by broad-band two-dimensional electronic spectroscopy. The optical response was measured in the 500-600 nm spectral region on the 0-400 fs time scale. Global target analysis of two-dimensional (2D) transient spectra revealed the main energy transfer pathways between carotenoid S₂, 1B _u^- and S₁ states and bacteriochlorophyll Q _x state. Global analysis ascertained the evolutionary and vibration-associated spectra, which also indicated the presence of a higher-lying vibrational level in the carotenoid S₁ state. The estimation of the spectral overlap between the 1B_u^- state and the Q_x state indicated a significant contribution of the 1B _u^- state to the overall S₂-to-Q_x excitation energy transfer.

Original language	English (US)
Pages (from-to)	11349-11362
Number of pages	14
Journal	Journal of Physical Chemistry B
Volume	117
Issue number	38
DOIs	https://doi.org/10.1021/jp403028x
State	Published - Sep 26 2013
Externally published	Yes

All Science Journal Classification (ASJC) codes

Materials Chemistry
Surfaces, Coatings and Films
Physical and Theoretical Chemistry

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title = "Energy transfer pathways in light-harvesting complexes of purple bacteria as revealed by global kinetic analysis of two-dimensional transient spectra",

abstract = "Excited state dynamics in LH2 complexes of two purple bacterial species were studied by broad-band two-dimensional electronic spectroscopy. The optical response was measured in the 500-600 nm spectral region on the 0-400 fs time scale. Global target analysis of two-dimensional (2D) transient spectra revealed the main energy transfer pathways between carotenoid S2, 1B u- and S1 states and bacteriochlorophyll Q x state. Global analysis ascertained the evolutionary and vibration-associated spectra, which also indicated the presence of a higher-lying vibrational level in the carotenoid S1 state. The estimation of the spectral overlap between the 1Bu- state and the Qx state indicated a significant contribution of the 1B u- state to the overall S2-to-Qx excitation energy transfer.",

author = "Ostroumov, {Evgeny E.} and Mulvaney, {Rachel M.} and Anna, {Jessica M.} and Cogdell, {Richard J.} and Scholes, {Gregory D.}",

year = "2013",

month = sep,

day = "26",

doi = "10.1021/jp403028x",

language = "English (US)",

volume = "117",

pages = "11349--11362",

journal = "Journal of Physical Chemistry B",

issn = "1520-6106",

publisher = "American Chemical Society",

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}

Energy transfer pathways in light-harvesting complexes of purple bacteria as revealed by global kinetic analysis of two-dimensional transient spectra. / Ostroumov, Evgeny E.; Mulvaney, Rachel M.; Anna, Jessica M. et al.
In: Journal of Physical Chemistry B, Vol. 117, No. 38, 26.09.2013, p. 11349-11362.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Energy transfer pathways in light-harvesting complexes of purple bacteria as revealed by global kinetic analysis of two-dimensional transient spectra

AU - Ostroumov, Evgeny E.

AU - Mulvaney, Rachel M.

AU - Anna, Jessica M.

AU - Cogdell, Richard J.

AU - Scholes, Gregory D.

PY - 2013/9/26

Y1 - 2013/9/26

N2 - Excited state dynamics in LH2 complexes of two purple bacterial species were studied by broad-band two-dimensional electronic spectroscopy. The optical response was measured in the 500-600 nm spectral region on the 0-400 fs time scale. Global target analysis of two-dimensional (2D) transient spectra revealed the main energy transfer pathways between carotenoid S2, 1B u- and S1 states and bacteriochlorophyll Q x state. Global analysis ascertained the evolutionary and vibration-associated spectra, which also indicated the presence of a higher-lying vibrational level in the carotenoid S1 state. The estimation of the spectral overlap between the 1Bu- state and the Qx state indicated a significant contribution of the 1B u- state to the overall S2-to-Qx excitation energy transfer.

AB - Excited state dynamics in LH2 complexes of two purple bacterial species were studied by broad-band two-dimensional electronic spectroscopy. The optical response was measured in the 500-600 nm spectral region on the 0-400 fs time scale. Global target analysis of two-dimensional (2D) transient spectra revealed the main energy transfer pathways between carotenoid S2, 1B u- and S1 states and bacteriochlorophyll Q x state. Global analysis ascertained the evolutionary and vibration-associated spectra, which also indicated the presence of a higher-lying vibrational level in the carotenoid S1 state. The estimation of the spectral overlap between the 1Bu- state and the Qx state indicated a significant contribution of the 1B u- state to the overall S2-to-Qx excitation energy transfer.

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ER -

Energy transfer pathways in light-harvesting complexes of purple bacteria as revealed by global kinetic analysis of two-dimensional transient spectra

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