Abstract
The new kind of electron spin echo (ESE), the “2 + 1” pulse train, is described. This method allows the measurement of dipole-dipole interactions between paramagnetic centers which are substantially weaker than those that can be measured by the ordinary two-pulse train. The dead time of ESE spectrometer response in this method is decreased to the duration of the first two pulses. The theory of dipole-dipole interaction in the ESE signal decay in the “2 + 1” pulse train is developed for different Flip rates and for different cases of spin spatial distribution. The theoretical data fit the experiment, carried out with model systems of H and D atoms, randomly distributed in the frozen solutions of sulfuric acid, and of biradicals. New data concerning the spatial distribution of radical clusters, resulting from y irradiation of the methanol, are given.
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