Primary Radical Pair P+H-Lifetime inRhodobactersphaeroideswith Blocked Electron Transfer to QA. Effect ofo-Phenanthroline

2008 ◽  
Vol 112 (6) ◽  
pp. 1858-1865 ◽  
Author(s):  
Krzysztof Gibasiewicz ◽  
Maria Pajzderska
Keyword(s):  
Electron Transfer ◽  
Radical Pair ◽  
Primary Radical ◽  
Primary Radical Pair

scholarly journals Access to Primary Charge Separation Mechanism in Photosynthetic Reaction Centers: Anisotropic Excitation Spectra of Electric Field Modulated Fluorescence Yields

1990 ◽  
Vol 45 (6) ◽  
pp. 763-770 ◽  
Author(s):  
U. Eberl
Keyword(s):  
Electron Transfer ◽  
Electric Field ◽  
Radical Pair ◽  
Primary Electron ◽  
Reaction Centers ◽  
Separation Mechanism ◽  
Primary Charge Separation ◽  
Excitation Spectra ◽  
Primary Radical ◽  
Primary Radical Pair

AbstractTwo-step sequential and unistep, superexchange primary electron transfer form primary radical pair states which differ in the direction and magnitude of their dipole moments as revealed in the X-ray structure analysis. The direction can be measured by the excitation anisotropy of electric field induced changes of the fluorescence yield. This method determines angles between the dipole of the primary radical pair and photoselected transition moments (in absorption and emission) of cofactors in the reaction centers. Transitions particularly favourable for discrimination between the two models of primary electron transfer are discussed.

Chemically induced dynamic nuclear and electron polarization. Part IX. The photolysis of tetrafluoro-p-benzoquinone in dioxane

1976 ◽  
Vol 54 (6) ◽  
pp. 979-983 ◽  
Author(s):  
Harish M. Vyas ◽  
Jeffrey K. S. Wan
Keyword(s):  
Radical Pair ◽  
Combination Product ◽  
Cross Combination ◽  
Excited Triplet ◽  
Primary Radical ◽  
Electron Polarization ◽  
Chemically Induced ◽  
Field Dependent ◽  
The Cross ◽  
Primary Radical Pair

The photoreduction of p-fluoranil in dioxane was studied by combined CIDNP and CIDEP techniques. It was established that the photoreactive species is the excited triplet of the quinone and the phototriplet mechanism is mainly responsible for the CIDEP observation. The CIDNP observations revealed the cage recombination of the primary radical-pair resulting in the formation of the cross-combination product from the semiquinone and the dioxane radicals. The cage recombination cannot be monitored by the conventional kinetic esr technique. The field dependent CIDNP intensity of the p-fluoranil in the photoreduction by fluorohydroquinone was also studied and a calculation based on Lawler's scheme showed that the results can be adequately explained by the radical-pair theory including both the scavenged and cage combination processes.

Nanosecond time-resolved magnetic resonance of the primary radical pair state PF of bacterial photosynthesis

1983 ◽  
Vol 105 (9) ◽  
pp. 2903-2904 ◽  
Author(s):  
Michael R. Wasielewski ◽  
Christian H. Bock ◽  
Michael K. Bowman ◽  
James R. Norris
Keyword(s):  
Magnetic Resonance ◽  
Radical Pair ◽  
Bacterial Photosynthesis ◽  
Time Resolved ◽  
Primary Radical ◽  
Primary Radical Pair ◽  
Pair State

scholarly journals Similarity of primary radical pair recombination in photosystem II and bacterial reaction centers

FEBS Letters ◽  
1993 ◽  
Vol 336 (2) ◽  
pp. 357-362 ◽  
Author(s):  
Martin Volk ◽  
Matthias Gilbert ◽  
Gerhard Rousseau ◽  
Martin Richter ◽  
Alexander Ogrodnik ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Radical Pair ◽  
Reaction Centers ◽  
Primary Radical ◽  
Bacterial Reaction Centers ◽  
Primary Radical Pair
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