Theoretical Studies on the Electronical Structure of the Special Pair Dimer and the Charge Separation Process for the Reaction Center Rhodopseudomonas viridis

1992 ◽  
pp. 193-207 ◽  
Author(s):  
P. O. J. Scherer ◽  
Sighart F. Fischer
Keyword(s):  
Reaction Center ◽  
Charge Separation ◽  
Separation Process ◽  
Theoretical Studies ◽  
Rhodopseudomonas Viridis ◽  
Special Pair

scholarly journals Primary processes in the bacterial reaction center probed by two-dimensional electronic spectroscopy

2018 ◽  
Vol 115 (14) ◽  
pp. 3563-3568 ◽  
Author(s):  
Andrew Niedringhaus ◽  
Veronica R. Policht ◽  
Riley Sechrist ◽  
Arkaprabha Konar ◽  
Philip D. Laible ◽  
...  
Keyword(s):  
Excited State ◽  
Reaction Center ◽  
Charge Separation ◽  
Purple Bacteria ◽  
Electronic Spectroscopy ◽  
Reaction Centers ◽  
Purple Bacterium ◽  
Absorption Bands ◽  
Sequential Reaction ◽  
Special Pair

In the initial steps of photosynthesis, reaction centers convert solar energy to stable charge-separated states with near-unity quantum efficiency. The reaction center from purple bacteria remains an important model system for probing the structure–function relationship and understanding mechanisms of photosynthetic charge separation. Here we perform 2D electronic spectroscopy (2DES) on bacterial reaction centers (BRCs) from two mutants of the purple bacterium Rhodobacter capsulatus, spanning the Qy absorption bands of the BRC. We analyze the 2DES data using a multiexcitation global-fitting approach that employs a common set of basis spectra for all excitation frequencies, incorporating inputs from the linear absorption spectrum and the BRC structure. We extract the exciton energies, resolving the previously hidden upper exciton state of the special pair. We show that the time-dependent 2DES data are well-represented by a two-step sequential reaction scheme in which charge separation proceeds from the excited state of the special pair (P*) to P+HA− via the intermediate P+BA−. When inhomogeneous broadening and Stark shifts of the B* band are taken into account we can adequately describe the 2DES data without the need to introduce a second charge-separation pathway originating from the excited state of the monomeric bacteriochlorophyll BA*.

scholarly journals Pump Probe Anisotropy Studies of the Photosynthetic Reaction Center

1999 ◽  
Vol 19 (1-4) ◽  
pp. 161-164
Author(s):  
D. C. Arnett ◽  
C. C. Moser ◽  
P. L. Dutton ◽  
N. F. Scherer
Keyword(s):  
Energy Transfer ◽  
Reaction Center ◽  
Charge Separation ◽  
Energy Levels ◽  
Photosynthetic Reaction Center ◽  
Ir Absorption ◽  
Optical Pulses ◽  
Pump Probe ◽  
Special Pair ◽  
Near Ir

The photosynthetic reaction center of Rb. sphaeroides is investigated by unique pump-probe anisotropy methods using 13 fs optical pulses tunable throughout the near IR absorption band. The time and wavelength resolved pump probe anisotropy transients yield detailed experimental descriptions of the energy levels, Py+ and Py- of the excitonically coupled special pair (P), and dynamics prior to charge separation, particularly energy transfer from the accessory bacteriochlorophylla's (B) to the special pair (P).

Electron Transfer from the Tetraheme Cytochrome to the Special Pair in the Rhodopseudomonas viridis Reaction Center: Effect of Mutations of Tyrosine L162

Biochemistry ◽  
1995 ◽  
Vol 34 (36) ◽  
pp. 11335-11343 ◽  
Author(s):  
Barbara Dohse ◽  
Paul Mathis ◽  
Joseph Wachtveitl ◽  
Eva Laussermair ◽  
So Iwata ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Reaction Center ◽  
Rhodopseudomonas Viridis ◽  
Special Pair ◽  
Center Effect ◽  
Tetraheme Cytochrome

scholarly journals Vibronic Coherence in the Charge Separation Process of the Rhodobacter sphaeroides Reaction Center

2018 ◽  
Vol 9 (8) ◽  
pp. 1827-1832 ◽  
Author(s):  
Fei Ma ◽  
Elisabet Romero ◽  
Michael R. Jones ◽  
Vladimir I. Novoderezhkin ◽  
Rienk van Grondelle
Keyword(s):  
Reaction Center ◽  
Rhodobacter Sphaeroides ◽  
Charge Separation ◽  
Separation Process
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