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Decay Of Multiple Spin Echoes In Dipolar Solids, C. H. Wang, John D. Ramshaw
Decay Of Multiple Spin Echoes In Dipolar Solids, C. H. Wang, John D. Ramshaw
Physics Faculty Publications and Presentations
In this paper we derive a general expression describing the evolution of the transverse nuclear-spin magnetization for the Ostroff-Waugh multiple-spin-echo experiment in dipolar solids. Our approach consists of expressing the formula for the magnetization at even echoes in a form resembling an ordinary time-correlation function, and then evaluating this quantity by means of Zwanzig's projection-operator technique. For long times, we show that under certain conditions the echo envelope decays exponentially, in agreement with experiment. A general expression is obtained for the time constant T* associated with the decay. This result may be used to generate an expansion of 1T …