Abstract
Electron spin resonance (esr) studies of fluorine-containing organic free radicals in X- and γ-irradiated single crystals has enabled an experimental measurement to be made of the isotropic and anisotropic hyperfine splittings and direction cosines for fluorine as well as for other nuclei containing a nonzero magnetic moment. From such data, the structure of fluorine-containing radicals has been deduced, the unpaired electron density in the 2pπ-orbitals has been calculated, the intramolecular motion exhibited by substituents of the radicals has been determined and the reaction coordinates measured for the decay and formation of radicals in oriented matrices. Since a large body of information is known, it is the purpose of this chapter to review the important structural features of fluorine-containing radicals oriented in irradiated single crystals. It will also be demonstrated that these radicals undergo a dynamic motion over a wide range of temperatures, that oxygen can diffuse into a number
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