TEMPERATURE-DEPENDENT ELECTRON-SPIN POLARIZATION OF THE TRIPLET-STATEOF THE PRIMARY DONOR IN PHOTOSYNTHETIC REACTION CENTERS OF RHODOPSEUDOMONAS-VIRIDIS - A TIME-RESOLVED EPR STUDY OF SINGLE-CRYSTALS AND SOLID-SOLUTION

Authors
VANDENBRINK JS GAST P HOFF AJ MANIKOWSKI H
Citation
Js. Vandenbrink et al., TEMPERATURE-DEPENDENT ELECTRON-SPIN POLARIZATION OF THE TRIPLET-STATEOF THE PRIMARY DONOR IN PHOTOSYNTHETIC REACTION CENTERS OF RHODOPSEUDOMONAS-VIRIDIS - A TIME-RESOLVED EPR STUDY OF SINGLE-CRYSTALS AND SOLID-SOLUTION, Applied magnetic resonance, 6(1-2), 1994, pp. 67-81
Citations number
37
Categorie Soggetti
Spectroscopy,"Physics, Atomic, Molecular & Chemical
Journal title
Applied magnetic resonance → ACNP
ISSN journal
09379347
Volume
6
Issue
1-2
Year of publication
1994
Pages
67 - 81
Database
ISI
SICI code
0937-9347(1994)6:1-2<67:TEPOTT>2.0.ZU;2-L
Abstract
The electron spin polarization (ESP) of triplet of the primary donor ( P-3) of Rhodopseudomonas viridis reaction centers (RCs) is anomalous a t temperatures above 25 K, i.e. the steady-state ESP changes from AEEA AE to AEAEAE. Fast, time-resolved EPR measurements in solid solution a nd single crystals of RCs show that this phenomenon results most proba bly from fast anisotropic spin-lattice relaxation in the radical pair triplet state (k(r) almost-equal-to 5 . 10(9) s-1 at 25 K).