scholarly journals Exciton-vibrational resonance and dynamics of charge separation in the photosystem II reaction center

2017 ◽  
Vol 19 (7) ◽  
pp. 5195-5208 ◽  
Author(s):  
Vladimir I. Novoderezhkin ◽  
Elisabet Romero ◽  
Javier Prior ◽  
Rienk van Grondelle
Keyword(s):  
Charge Transfer ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Reaction Center ◽  
Charge Separation ◽  
Natural Conditions ◽  
Vibrational Resonance ◽  
Laser Experiment

A mixing of the exciton and charge transfer states promoted by a resonant vibrational quantum allows faster penetration of excitation energy into the primary photoproduct in the photosystem II reaction center both in laser experiment and under natural conditions.

scholarly journals Asymmetry in Charge Transfer Pathways Caused by Pigment–Protein Interactions in the Photosystem II Reaction Center Complex

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 718
Author(s):  
Yoshihiro Sato ◽  
Danielle Sicotte
Keyword(s):  
Charge Transfer ◽  
Photosystem Ii ◽  
Reaction Center ◽  
Protein Interactions ◽  
Energy Levels ◽  
Tight Binding ◽  
Relative Displacement ◽  
Primary Charge Separation ◽  
Binding Model ◽  
Reaction Center Complex

This article discusses the photoinduced charge transfer (CT) kinetics within the reaction center complex of photosystem II (PSII RC). The PSII RC exhibits a structural symmetry in its arrangement of pigments forming two prominent branches, D1 and D2. Despite this symmetry, the CT has been observed to occur exclusively in the D1 branch. The mechanism to realize such functional asymmetry is yet to be understood. To approach this matter, we applied the theoretical tight-binding model of pigment excitations and simulated CT dynamics based upon the framework of an open quantum system. This simulation used a recently developed method of computation based on the quasi-adiabatic propagator path integral. A quantum CT state is found to be dynamically active when its site energy is resonant with the exciton energies of the PSII RC, regardless of the excitonic landscape we utilized. Through our investigation, it was found that the relative displacement between the local molecular energy levels of pigments can play a crucial role in realizing this resonance and therefore greatly affects the CT asymmetry in the PSII RC. Using this mechanism phenomenologically, we demonstrate that a near 100-to-1 ratio of reduction between the pheophytins in the D1 and D2 branches can be realized at both 77 K and 300 K. Our results indicate that the chlorophyll Chl D 1 is the most active precursor of the primary charge separation in the D1 branch and that the reduction of the pheophytins can occur within pico-seconds. Additionally, a broad resonance of the active CT state implies that a large static disorder observed in the CT state originates in the fluctuations of the relative displacements between the local molecular energy levels of the pigments in the PSII RC.

scholarly journals Excitation Energy Transfer and Charge Separation in Photosystem II Membranes Revisited

2006 ◽  
Vol 91 (10) ◽  
pp. 3776-3786 ◽  
Author(s):  
Koen Broess ◽  
Gediminas Trinkunas ◽  
Chantal D. van der Weij-de Wit ◽  
Jan P. Dekker ◽  
Arie van Hoek ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Charge Separation ◽  
Excitation Energy Transfer

Energy transfer, charge separation and pigment arrangement in the reaction center of Photosystem II

1994 ◽  
Vol 1184 (2-3) ◽  
pp. 242-250 ◽  
Author(s):  
J.P.M. Schelvis ◽  
P.I. van Noort ◽  
T.J. Aartsma ◽  
H.J. van Gorkom
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Reaction Center ◽  
Charge Separation
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