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Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 105, 2007 - Issue 15-16: A Special Issue Dedicated to Professor Arthur Schweiger
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Original Articles

ENDOR study of the dynamic properties of stable paramagnetic centres in γ-irradiated L-alanine crystals

Boris Rakvin Ruđer Bošković Institute, P.O. Box 180, Zagreb, 10002, CroatiaCorrespondence[email protected]
,
Nadica Maltar-Strmečki Faculty of Veterinary Medicine, University of Zagreb, P.O. Box 466, Zagreb, 10002, Croatia
,
Daniel KattNig Institute of Physical and Theoretical Chemistry, Graz University of Technology, Technikerstraße 4/I, Graz, A-8010, Austria
&
Günter Grampp Institute of Physical and Theoretical Chemistry, Graz University of Technology, Technikerstraße 4/I, Graz, A-8010, Austria
Pages 2087-2094 | Received 28 May 2007, Accepted 06 Aug 2007, Published online: 04 Dec 2010
 
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Abstract

The dynamic properties of the stable L-alanine radicals SAR1 and SAR2 induced by γ-irradiation of a L-alanine crystal have been investigated using the electron nuclear double resonance technique (ENDOR). The study was focused on the dynamic properties of these centres in the temperature range from 180 to 320 K. In this region, the motion of the and CH3 groups exhibits slow and fast motional dynamics in comparison with the nuclear and electron Larmor frequencies, respectively. The correlation rotation times of the CH3 and groups of the SAR2 CH3 group and the neighbouring CH3 group of the SAR1 paramagnetic centre were estimated from the spectral line broadening and spectral intensity.

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