Abstract
Longitudinally modulated electron-nuclear double-resonance (LOMENDOR) studies of partially deuterated radicals in a γ-irradiated single crystal of potassium hydrogen malonate have been performed over a temperature range from 90 to 310 K. First- and second-harmonic LOMENDOR and variable-frequency LOMENDOR spectra of the α proton and the α deuteron have allowed the determination of the electron- and nuclear-relaxation times and the corresponding relaxation probabilities. The experimental results have shown that the intermolecular and intramolecular relaxation processes are dominant modes of electron spin-lattice relaxation. A strong contribution to the nuclear spin-lattice-relaxation mechanism by the nuclear-quadrupole-relaxation rate must also be assumed for the deuterated radicals
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