Geometrical description of echoes and macroscopic reorientation of samples in solid-state NMR

摘要

A geometrical approach of the quadrupolar interaction is presented.First- and second-order effects on all transitions are represented by quadrics and quartics.This approach allows a simple and exhaustive description of the Solomon multiple echoes:the location of the echoes in the time domain,as well as their nature,is determined without calculation.Experimental evidence of multiple echoes in the case of a ~27A1-O-P cluster is presented.The selection of 2Q coherences by appropriate phase cycling is presented as well.DAS and MQ MAS experiments are also described in this particular frame.To cite this article:C.Bonhomme et al,C.R.Chimie 7(2004).