Utilizing the Dynamic Stark Shift as a Probe for Dielectric Relaxation in Photosynthetic Reaction Centers During Charge Separation

2013 ◽  
Vol 117 (38) ◽  
pp. 11383-11390 ◽  
Author(s):  
Zhi Guo ◽  
Su Lin ◽  
Neal W. Woodbury
Keyword(s):  
Dielectric Relaxation ◽  
Charge Separation ◽  
Stark Shift ◽  
Reaction Centers ◽  
Photosynthetic Reaction Centers ◽  
Dynamic Stark Shift

scholarly journals Excitonic structure and charge separation in the heliobacterial reaction center probed by multispectral multidimensional spectroscopy

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yin Song ◽  
Riley Sechrist ◽  
Hoang H. Nguyen ◽  
William Johnson ◽  
Darius Abramavicius ◽  
...  
Keyword(s):  
Reaction Center ◽  
Charge Separation ◽  
Electronic Spectroscopy ◽  
Spectroscopic Studies ◽  
Primary Electron ◽  
Reaction Centers ◽  
Separation Mechanism ◽  
Photosynthetic Reaction Centers ◽  
Density Analysis ◽  
Function Relationship

AbstractPhotochemical reaction centers are the engines that drive photosynthesis. The reaction center from heliobacteria (HbRC) has been proposed to most closely resemble the common ancestor of photosynthetic reaction centers, motivating a detailed understanding of its structure-function relationship. The recent elucidation of the HbRC crystal structure motivates advanced spectroscopic studies of its excitonic structure and charge separation mechanism. We perform multispectral two-dimensional electronic spectroscopy of the HbRC and corresponding numerical simulations, resolving the electronic structure and testing and refining recent excitonic models. Through extensive examination of the kinetic data by lifetime density analysis and global target analysis, we reveal that charge separation proceeds via a single pathway in which the distinct A0 chlorophyll a pigment is the primary electron acceptor. In addition, we find strong delocalization of the charge separation intermediate. Our findings have general implications for the understanding of photosynthetic charge separation mechanisms, and how they might be tuned to achieve different functional goals.

scholarly journals Excitonic Structure and Charge Separation in the Heliobacterial Reaction Center Probed by Multispectral Multidimensional Spectroscopy

2021 ◽  
Author(s):  
Yin Song ◽  
Riley Sechrist ◽  
Hoang Huy Nguyen ◽  
William Johnson ◽  
Darius Abramavičius ◽  
...  
Keyword(s):  
Reaction Center ◽  
Charge Separation ◽  
Electronic Spectroscopy ◽  
Spectroscopic Studies ◽  
Primary Electron ◽  
Reaction Centers ◽  
Separation Mechanism ◽  
Photosynthetic Reaction Centers ◽  
Density Analysis ◽  
Function Relationship

<p>Photochemical reaction centers are the engines that drive photosynthesis. The reaction center from heliobacteria (HbRC) has been proposed to most closely resemble the common ancestor of photosynthetic reaction centers, motivating a detailed understanding of its structure-function relationship. The recent elucidation of the HbRC crystal structure motivates advanced spectroscopic studies of its excitonic structure and charge separation mechanism. We perform multispectral two-dimensional electronic spectroscopy of the HbRC and corresponding numerical simulations, resolving the electronic structure and testing and refining recent excitonic models. Through extensive examination of the kinetic data by lifetime density analysis and global target analysis, we reveal that charge separation proceeds via a single pathway in which the distinct A<sub>0 </sub>chlorophyll <i>a</i> pigment is the primary electron acceptor. In addition, we find strong delocalization of the initial excited state and charge separation intermediate. Our findings have general implications for the understanding of photosynthetic charge separation mechanisms, and how they might be tuned to achieve different functional goals.</p>

Electric field-induced decrease of quantum yield of charge separation in photosynthetic reaction centers

1992 ◽  
Vol 198 (6) ◽  
pp. 653-658 ◽  
Author(s):  
A. Ogrodnik ◽  
T. Langenbacher ◽  
G. Bieser ◽  
J. Siegl ◽  
U. Eberl ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Electric Field ◽  
Charge Separation ◽  
Reaction Centers ◽  
Photosynthetic Reaction Centers

Insights into the factors controlling the rates of the deactivation processes that compete with charge separation in photosynthetic reaction centers

1993 ◽  
Vol 176 (2-3) ◽  
pp. 615-629 ◽  
Author(s):  
Laurent Laporte ◽  
Lynda M. McDowell ◽  
Christine Kirmaier ◽  
Craig C. Schenck ◽  
Dewey Holten
Keyword(s):  
Charge Separation ◽  
Reaction Centers ◽  
Photosynthetic Reaction Centers
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