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In 1 H– 2 H cross polarization (CP) under magic-angle spinning (MAS), it has been pointed out that modulation of a H2 resonance frequency caused by MAS acts as adiabatic frequency sweep and efficient CP over the broad H2 powder pattern can be achieved. The adiabaticity, however, does not hold when the MAS frequency becomes faster, leading to insufficient CP enhancement. In this work,...
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