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Selective detection of EchoEPR signals due to naturally substituted C-13 radicals in a single crystal of ammonium tartrate
Univ Padua, Dept Phys Chem, I-35131 Padua, Italy Univ Florence, Dept Chem, Florence, Italy Linkoping Univ, Dept Phys & Measurement Tech, Linkoping, Sweden.
Univ Padua, Dept Phys Chem, I-35131 Padua, Italy Univ Florence, Dept Chem, Florence, Italy Linkoping Univ, Dept Phys & Measurement Tech, Linkoping, Sweden.
Univ Padua, Dept Phys Chem, I-35131 Padua, Italy Univ Florence, Dept Chem, Florence, Italy Linkoping Univ, Dept Phys & Measurement Tech, Linkoping, Sweden.
Univ Padua, Dept Phys Chem, I-35131 Padua, Italy Univ Florence, Dept Chem, Florence, Italy Linkoping Univ, Dept Phys & Measurement Tech, Linkoping, Sweden.
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2001 (English)In: Applied Magnetic Resonance, ISSN 0937-9347, Vol. 20, no 1-2, 171-188 p.Article in journal (Refereed) Published
Abstract [en]

Echo-detected electron paramagnetic resonance (echoEPR) profiles for irradiated deuterated ammonium tartrate single crystals depend strongly on the delays between pulses of the echo sequence. This is mainly due to instantaneous and spectral diffusion that plays a crucial role in determining the decay of the echo at every field position: the dephasing rate 1/T-M depends on the number of spins excited by the pulses and on the total number of interacting spins. A rigorous simulation of the echoEPR profiles at different delays requires the evaluation of the modulation pattern (ESEEM) and of the dephasing processes at every field position. From the simulations, information on the microscopic radical concentration, and on the electron-electron flip-flop rates of the single radical species can be obtained. Natural isotope C-13 substitution generates low-concentration radicals with relaxation properties different from the equivalent C-12-substitued radicals. The different behavior is discussed.

Place, publisher, year, edition, pages
2001. Vol. 20, no 1-2, 171-188 p.
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Engineering and Technology
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URN: urn:nbn:se:liu:diva-49231OAI: oai:DiVA.org:liu-49231DiVA: diva2:270127
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-13

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Lund, Anders

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