Abstract
Previously we have provided a quantitative theory that explains the apparent field dependence observed for chemical shifts in high resolution solids state 13C nuclear magnetic resonance spectroscopy (where magic angle spinning is combined with high-power 1H decoupling). We have expanded that theoretical treatment so as to include the effect of homonuclear dipole–dipole couplings among the abundant nuclear spin species, and to the impact of off-resonance rf fields. These differing contributions to the residual linewidths are assessed in a unified theoretical treatment using the Floquet theory for time-dependent Hamiltonians. Some comments are provided as to the circumstances in which the various contributing terms dominate.
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