Coherent Averaging Effects in Magnetic Resonance

作者：U. Haeberlen, John S. Waugh · 发表于：Physical Review · 年份：1968 · DOI：10.1103/physrev.175.453 · 被引用次数：1092 · 研究领域：Advanced NMR Techniques and Applications、NMR spectroscopy and applications、Advanced MRI Techniques and Applications

A theory is developed to describe the slow component of the transient decay of transverse spin magnetization, and the central component of the slow-passage absorption spectrum, of a system of spins which is subjected to a periodic and cyclic perturbation. The theory is used to analyze and compare various schemes for high-resolution NMR of solids, including the spinning of the sample about an axis oriented at the "magic angle," the rotating-frame magic-angle experiment of Lee and Goldburg, pulsed versions of the latter, and a number of new pulsed-NMR experiments recently developed in this laboratory. Attention is focused on the factors, both theoretical and practical, which are important in obtaining optimal suppression of static dipole-dipole interactions and quadrupole splittings, and retention of chemical and Knight shifts and scalar spin-spin interactions. Several new experiments are proposed.