Adiabatic Rapid-Passage Experiments in Some Solids

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Abstract
Two types of adiabatic rapid‐passage experiments are considered for measuring spin‐lattice relaxation times in solids, and results are shown for calcium fluoride, stearic acid, and lithium stearate. Although rapid‐passage experiments using a symmetric‐sweep method give shorter T 1 values in the substances examined than do experiments using a sequence of two rapid passages spaced at varying times, the two values may be brought together by applying a correction to the symmetric‐sweep results for possible failure to invert completely the magnetization in the fast passage. For calcium fluoride and stearic acid, recovery from saturation experiments were also done and the T 1 values obtained from these experiments agree very well with the relaxation times found by rapid‐passage methods.