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The general problems associated with the removal of the effects of dipolar broadening from solid state NMR spectra are analyzed. The effects of finite pulse width and H1 inhomogeneity are shown to have limited the resolution of previous pulse cycles and a new eight pulse cycle designed to minimize these problems is discussed. Spectra for F19 in CaF2 taken with this cycle are presented showing residual linewidth near 10 Hz. The feasibility of measuring proton chemical shift tensors is discussed.
Rhim et al. (Mon,) studied this question.
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