A broad-banded z-rotation windowed phase-modulated Lee–Goldburg pulse sequence for 1H spectroscopy in solid-state NMR

High-resolution 1H spectroscopy in solid-state NMR, rendered difficult due to the strong 1H–1H homonuclear dipolar coupling, has been made possible under magic-angle spinning with homonuclear dipolar decoupling schemes, such as windowed phase-modulated Lee–Goldburg. Here, we outline the theory and implementation of a modification of this scheme with which an effective z-rotation for the magnetisation is obtained over a wide range of spectral window. Experimental results are presented for samples, such as glycine, histidine, and tryosine.