Abstract
A low radio frequency power polarization inversion spin exchange at the magic angle (PISEMA) pulse sequence is described for the measurement of heteronuclear dipolar couplings from solids. The method employs a time averaged nutation concept to significantly reduce the rf power required to spin-lock low γ nuclear spins in PISEMA experiments. The efficacy of the 2D method is demonstrated on a single crystal of n-acetyl- l- 15N-valyl- l- 15N-leucine dipeptide to measure 1H– 15N dipolar couplings and a liquid crystal sample to measure 1H– 13C dipolar couplings.
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