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A novel high-field/high-frequency EPR and ENDOR spectrometer operating at 3 mm wavelength
A high-field/high-frequency EPR and ENDOR system operating at 3 mm wavelength is described. The probe-head designs of two different resonator types, i.e. an open Fabry-Perot resonator and aExpand
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A TIME-RESOLVED ELECTRON NUCLEAR DOUBLE RESONANCE STUDY OF THE PHOTOEXCITED TRIPLET STATE OF P680 IN ISOLATED REACTION CENTERS OF PHOTOSYSTEM II
Abstract A time-resolved ENDOR spectrum of the triplet state of the primary donor of photosystem II in isolated reaction centers has been obtained at cryogenic temperatures. Selective excitation ofExpand
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General TRIPLE resonance on free radicals in solution. Determination of relative signs of isotropic hyperfine coupling constants
For the first time a general type of electron–nuclear–nuclear TRIPLE resonance has been performed on radicals in liquid solution. In this method two inequivalent nuclei are irradiated simultaneouslyExpand
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Endor and triple resonance in solutions of the chlorophyll a and bis(chlorophyll)cyclophane radical cations
Abstract The radical cations of chlorophyll a (Chl a) and bis ( chlorophyll )cyclophane (BCP), a synthetic model dimer of chlorophyll, were studied by ENDOR and TRIPLE resonance in liquid solution.Expand
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Time-resolved EPR study of exciton hopping in porphyrin dimers in their photoexcited triplet state
We have used time-resolved electron-paramagnetic resonance (EPR) spectroscopy to investigate the triplet energy transfer in various covalently linked porphyrin dimers. For all these dimers the fineExpand
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Light-induced triplet electron transfer in cyclohexene-bridged porphyrin–quinones detected by time-resolved electron paramagnetic resonance spectroscopy
Light-induced triplet electron transfer (ET) is observed in two isomeric cyclohexene-bridged porphyrin–quinones (P–Q) in highly viscous ethanol at temperatures between 130 and 150 K. Both the primaryExpand
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ENDOR studies of π-electron delocalization in covalently linked porphyrin dimers. Model systems for the primary donor in photosynthesis?
The spin density distributions in the cation radicals of various covalently linked tetraphenyl porphyrin dimers and of their monomeric constituents have been studied by liquid-phase EPR, ENDOR andExpand
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The pheophytin a anion radical. 14N and 1H endor and triple resonance in liquid solution
Abstract From electrolytically generated phcophytin a anion radicals in solution, 12 proton and 2 nitrogen hyperfine coupling constants, including signs, were determined by ENDOR and TRIPLE resonanceExpand
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Photochemical Reactions and Photoinduced Electron‐Transfer Processes in Liquids, Frozen Solutions, and Proteins as Studied by Multifrequency Time‐Resolved EPR Spectroscopy
In this overview, modern multifrequency EPR spectroscopy, in particular at high magnetic fields, is shown to provide detailed information about structure, motional dynamics, and spin chemistry ofExpand
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Fluorine and proton ENDOR of aromatic radicals in solution
Abstract Electron nuclear double resonance (ENDOR) experiments were performed on fluorinated benzophenone and semi-quinone anion radicals. By detecting both fluorine and proton ENDOR signals it wasExpand
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