Solid-state NMR imaging methods.: Part II:: Line narrowing

Part I of this paper elucidated the principle of NMR imaging and spatial information applicable to materials. The principles of NMR with spatial resolution by frequency and phase encoding are introduced. The NMR line-broadening effect characteristic for dipolar or quadrupolar solids can be surpassed by strong field gradients or line-narrowing methods. In this part the basic principles of imaging methods with line-narrowing by magic-angle sample spinning, excitation at the magic angle in the rotating frame, magic-echoes, and multiple-pulse excitation are presented. The advantages and limitations of these methods are discussed, and examples of current development given. (C) 2000 John Wiley & Sons, Inc.