Line width analysis, electron paramagnetic

Electron paramagnetic resonance (EPR) spectroscopy (also called electron spin resonance (ESR) spectroscopy), is used to study paramagnetic species with one or more unpaired electrons, e.g. free radicals, diradicals, metal complexes containing paramagnetic metal centres, defects in semiconductors and irradiation effects in solids. While diamagnetic materials are EPR silent, paramagnetic species always exhibit an EPR spectrum. This consists of one or more lines, depending on the interactions between the unpaired electron (which acts as a probe ) and the molecular framework in which it is located. Analysis of the shape of the EPR spectrum (the number and positions of EPR lines, their intensities and line widths) provides information... 

Numerous dynamic and kinetic studies have been performed using O NMR. Line shape analysis is not straightforward because the line width itself is temperature dependent. Nevertheless, it has been shown that dynamic O NMR is a convenient alternative to NMR with, for example, methyl carbonyl compounds. A substantial number of publications have been concerned primarily with studies of the hydration (solvation) of ions in solution and the determination of rates and activation parameters for ligand substitution (a rapid development of high-pressure NMR has occurred in the last twenty years). There is an extensive literature of NMR spectroscopy used for the study of hyperfine interactions between the unpaired electrons in paramagnetic molecules and ions and the nucleus. The... 

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