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Hahn-echoes from 14N in solids by the stray-field method: prospects for imaging using Long Echo-Train Summation
E W Randall1, A A Samoilenko, R Fu
1Department of Chemistry, Queen Mary and Westfield College, London, UK.
Abstract:
We have observed Hahn-echoes resulting from Powles-Mansfield pulse-sequences for a variety of nitrogen containing solids which exhibit a range of 14N electric quadrupole coupling constants (Cq) from 0 to 4.9 MHz. Long echo-decays were frequently obtained which allowed the collection of many echoes in one echo-train, so that the method of Long Echo-Train Summation (LETS), could be used to accumulate signal. A one-dimensional STRAFI-profile is shown for solid ammonium nitrate. The spatial resolution is discussed as a function of Cq.
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