ELECTRON-SPIN POLARIZATION IN THE DONOR TRIPLET-STATE OF BACTERIAL PHOTOSYNTHETIC REACTION CENTERS .2. ANISOTROPIC INVERSION OF ELECTRON-SPIN POLARIZATION IN A 3-SPIN MODEL REACTION CENTER
An explanation is proposed for the electron spin polarization pattern in the ΔmS = ± 1 EPR spectrum of the donor triplet state in pre-reduced Rhodopseudomonas viridis reaction centres at temperatures above 20 K. Calculations based on a simple model of the reaction centre indicate that rapid spin-lat...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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1988
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| _version_ | 1797091859597623296 |
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| author | Hore, P Hunter, D Vanwijk, F Schaafsma, T Hoff, A |
| author_facet | Hore, P Hunter, D Vanwijk, F Schaafsma, T Hoff, A |
| author_sort | Hore, P |
| collection | OXFORD |
| description | An explanation is proposed for the electron spin polarization pattern in the ΔmS = ± 1 EPR spectrum of the donor triplet state in pre-reduced Rhodopseudomonas viridis reaction centres at temperatures above 20 K. Calculations based on a simple model of the reaction centre indicate that rapid spin-lattice relaxation of the iron-semiquinone complex (QA-Fe2+) can perturb the polarization of the donor triplet provided the EPR frequency of QA-Fe2+ is close to that of P+ (the cation of the primary donor) and I- (the anion of the intermediary acceptor). In agreement with experimental observations, this mechanism only operates in the presence of a large exchange interaction between I- and QA-Fe2+. The observed anisotropy of this effect is attributed to the anisotropy of the resonance frequency of QA-Fe2+. © 1988. |
| first_indexed | 2024-03-07T03:38:21Z |
| format | Journal article |
| id | oxford-uuid:bd0d80d7-aef3-430e-9c6b-c3cac507c588 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:38:21Z |
| publishDate | 1988 |
| record_format | dspace |
| spelling | oxford-uuid:bd0d80d7-aef3-430e-9c6b-c3cac507c5882022-03-27T05:28:53ZELECTRON-SPIN POLARIZATION IN THE DONOR TRIPLET-STATE OF BACTERIAL PHOTOSYNTHETIC REACTION CENTERS .2. ANISOTROPIC INVERSION OF ELECTRON-SPIN POLARIZATION IN A 3-SPIN MODEL REACTION CENTERJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:bd0d80d7-aef3-430e-9c6b-c3cac507c588EnglishSymplectic Elements at Oxford1988Hore, PHunter, DVanwijk, FSchaafsma, THoff, AAn explanation is proposed for the electron spin polarization pattern in the ΔmS = ± 1 EPR spectrum of the donor triplet state in pre-reduced Rhodopseudomonas viridis reaction centres at temperatures above 20 K. Calculations based on a simple model of the reaction centre indicate that rapid spin-lattice relaxation of the iron-semiquinone complex (QA-Fe2+) can perturb the polarization of the donor triplet provided the EPR frequency of QA-Fe2+ is close to that of P+ (the cation of the primary donor) and I- (the anion of the intermediary acceptor). In agreement with experimental observations, this mechanism only operates in the presence of a large exchange interaction between I- and QA-Fe2+. The observed anisotropy of this effect is attributed to the anisotropy of the resonance frequency of QA-Fe2+. © 1988. |
| spellingShingle | Hore, P Hunter, D Vanwijk, F Schaafsma, T Hoff, A ELECTRON-SPIN POLARIZATION IN THE DONOR TRIPLET-STATE OF BACTERIAL PHOTOSYNTHETIC REACTION CENTERS .2. ANISOTROPIC INVERSION OF ELECTRON-SPIN POLARIZATION IN A 3-SPIN MODEL REACTION CENTER |
| title | ELECTRON-SPIN POLARIZATION IN THE DONOR TRIPLET-STATE OF BACTERIAL PHOTOSYNTHETIC REACTION CENTERS .2. ANISOTROPIC INVERSION OF ELECTRON-SPIN POLARIZATION IN A 3-SPIN MODEL REACTION CENTER |
| title_full | ELECTRON-SPIN POLARIZATION IN THE DONOR TRIPLET-STATE OF BACTERIAL PHOTOSYNTHETIC REACTION CENTERS .2. ANISOTROPIC INVERSION OF ELECTRON-SPIN POLARIZATION IN A 3-SPIN MODEL REACTION CENTER |
| title_fullStr | ELECTRON-SPIN POLARIZATION IN THE DONOR TRIPLET-STATE OF BACTERIAL PHOTOSYNTHETIC REACTION CENTERS .2. ANISOTROPIC INVERSION OF ELECTRON-SPIN POLARIZATION IN A 3-SPIN MODEL REACTION CENTER |
| title_full_unstemmed | ELECTRON-SPIN POLARIZATION IN THE DONOR TRIPLET-STATE OF BACTERIAL PHOTOSYNTHETIC REACTION CENTERS .2. ANISOTROPIC INVERSION OF ELECTRON-SPIN POLARIZATION IN A 3-SPIN MODEL REACTION CENTER |
| title_short | ELECTRON-SPIN POLARIZATION IN THE DONOR TRIPLET-STATE OF BACTERIAL PHOTOSYNTHETIC REACTION CENTERS .2. ANISOTROPIC INVERSION OF ELECTRON-SPIN POLARIZATION IN A 3-SPIN MODEL REACTION CENTER |
| title_sort | electron spin polarization in the donor triplet state of bacterial photosynthetic reaction centers 2 anisotropic inversion of electron spin polarization in a 3 spin model reaction center |
| work_keys_str_mv | AT horep electronspinpolarizationinthedonortripletstateofbacterialphotosyntheticreactioncenters2anisotropicinversionofelectronspinpolarizationina3spinmodelreactioncenter AT hunterd electronspinpolarizationinthedonortripletstateofbacterialphotosyntheticreactioncenters2anisotropicinversionofelectronspinpolarizationina3spinmodelreactioncenter AT vanwijkf electronspinpolarizationinthedonortripletstateofbacterialphotosyntheticreactioncenters2anisotropicinversionofelectronspinpolarizationina3spinmodelreactioncenter AT schaafsmat electronspinpolarizationinthedonortripletstateofbacterialphotosyntheticreactioncenters2anisotropicinversionofelectronspinpolarizationina3spinmodelreactioncenter AT hoffa electronspinpolarizationinthedonortripletstateofbacterialphotosyntheticreactioncenters2anisotropicinversionofelectronspinpolarizationina3spinmodelreactioncenter |