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NMR in solids: Thermodynamic effects of a pair of rf pulses on a system with two spin species

par Broekaert, Paul ;Jeener, Jean
Référence Physical review. B, Condensed matter, 15, 9, page (4168-4173)
Publication Publié, 1977

Article révisé par les pairs

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Résumé :

NMR pulse experiments performed simultaneously on Li7 and F19 in a LiF crystal, provide a quantitative verification of various theoretical predictions about relations between the Zeeman and dipolar components of the free-induction-decay signals, and the efficiency of transfer of Zeeman order into dipolar order by a phase-shifted pulse pair. An internal relaxation time of about 400 sec is observed on the dipolar subsystem when the field is along the [111] direction. An interpretation is proposed for this "slow" approach to internal equilibrium. © 1977 The American Physical Society.