Abstract
The optimum14N pulse lengths in the13C–14N rotational-echo adiabatic-passage double-resonance (REAPDOR) NMR experiment are determined from calculations and from experiments on samples of glycine andl-alanine. The REAPDOR experiment utilizes the adiabatic passages that14N spins make between the14N Zeeman energy levels during the application of a single, short14N radiofrequency pulse. Use of a short14N irradiation time of less than one-quarter of a rotor period ensures that the number of14N spins that undergo more than one passage is minimized. This simplifies calculations describing13C dipolar dephasing and provides better agreement between calculations and experiments. Recovery of the13C–14N dipolar couplings and14N quadrupolar coupling constants and asymmetry parameters is described.
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