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The relationship of reversibility and irreversibility in the evolution of dipole operators in the density matrix of 19 F nuclei spin system in CaF 2 is investigated. A magic echo due to these operators has been observed and studied. The behaviour of the dipole magic echo signals proved different for the cases of operators having diagonal and nondiagonal matrix elements. The interpretation of the observed effects involves the theory of mixing in thermodynamical systems.
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Skrebnev et al. (1986) studied this question.
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