Nuclear-Magnetic-Resonance Free Induction Decay in a Two-Spin System

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Abstract
Measurements and calculations of the nuclear-magnetic-resonance free induction decay (FID) in sodium chloride are presented. The experiments consisted of the observation, by standard pulse techniques, of the FID in the sodium spin system at several crystal orientations. The calculation represents an extension of the method of Lowe and Norberg to the case where both nuclear species have arbitrary spin. Theory and experiment are in very good agreement. Quadrupolar effects due to intentional straining of the crystal could only be produced by rapid quenching from just below the melting point to room temperature. It thus appears that only in such severely strained crystals is quadrupolar broadening appreciable.