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Abstract
ENDOR spectroscopy was used to elucidate the domain structure of benzil accompanying its phase transition at 84°K. Spectral twinning was observed on a single-crystalline sample as a result of multidomain formation below the phase transition temperature. This twinning was explained by applying the Landau theory of phase transitions. With knowledge of the anisotropy of the proton hyperfine interaction, we extracted the angle between the domains and the morphologic two-fold axis to be 1.55° at 2°K.