魔角旋转情形下固体的非均匀相互作用

各向异性非均匀相互作用的慢旋转MAS-NMR谱是一系列的旋转边带,这些边带的强度包含了该相互作用张量的全部信息,只要计算和分析少数几条边带就可以得到这些有用的结构信息,本文用不可约球谐张量算符表示非均匀相互作用,采用Bessel函数展开法分析计算非均匀相互作用产生的旋转边带,这种分析计算方法适用于各种非均匀相互作用。以化学位移和四极相互作用为例的实验与理论符合很好。关键词：

INHOMOGENEOUS INTERACTIONS OF SOLIDS UNDER MAS

The inhomogeneous anisotropic interactions of solids under MAS of slow rotation break up the NMR spectra into a series of spinning sidebands which contain all the information about the interaction tensors. This structural useful information can be extracted by computing and analysing only a few of ths sidebands. This method ,which is applicable for various inhomogeneous interactions and is based on an expansion of the Bessel functions using the irreducible spherical tensor and operator representation of the spin interactions, is reported in the paper. The experimental spectra of typical samples dominated respectively by chemical and quadrupolar interaction agree well with the theoretical ones.