Abstract
Continuous wave (CW) EPR and ENDOR methods for studies of radical structure in single crystals and powders are reviewed. Improvements of the standard Schonland procedure to obtain hyperfine-and for I>1/2 nuclei also quadrupolar tensors from single crystal ENDOR measurements are described. A recently developed method to simulate powder ENDOR spectra of radicals is suggested as an alternative method of analysis when single crystal data are not available. Good agreement with experimental spectra for the I-alanine powder system was obtained. Control of power saturation has become essential in quantitative EPR, and a recently devised numerical procedure has proved useful to obtain relaxation times by the classical CW saturation method. Spectrum simulation methods are described that take into account the different influence of the microwave power on normal and spin flip EPR lines often appearing in the solid state. Internal motion of radicals, frequently occurring also in solid matrices, has been analysed with a slight modification of the established procedure for isotropic exchange in cases when the anisotropy of the hyperfine couplings is not affected by the dynamics. Results contained in thesis studies that are not easily available elsewhere concerning dynamics of neutral and ionic radicals in disordered matrices and in zeolites are presented. Recent results concerning the adsorption/desorption and diffusion of odd-electron NO and NO2 are also presented. During the course of the work several computer programmes have been developed or modified to help the analysis.
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Lund, A., Liu, W. (2003). Continuous Wave EPR of Radicals in Solids. In: Lund, A., Shiotani, M. (eds) EPR of Free Radicals in Solids. Progress in Theoretical Chemistry and Physics, vol 10. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-5166-6_1
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