Limits to resolution in multiple-pulse NMR

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Abstract
An experimental and theoretical account is presented of various multiple-pulse experiments in solids based on cycles using reflection symmetry. The line-narrowing efficiency or spectral resolution of these cycles depends critically on the residual terms in the effective Hamiltonian. We identify three resonance-offset-dependent line-broadening mechanisms. Several new pulse sequences which reduce the broadening caused by these sources are demonstrated. The spectrometer alignment procedure for multiple-pulse sequences is described in detail and the effect of a particular phase-alignment error on line-narrowing efficiency is discussed.

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