Abstract
We show that rotational echo double resonance (REDOR) experiments can be carried out without proton decoupling under the conditions of fast spinning and strong rf field. Numerical simulations on a five-spin systems show that no significant attenuation of the reference signal ( S 0) is observed at a spin rate of 25 kHz, provided that the rf power is larger than 100 kHz. This approach has been validated by 31P{ 13C} REDOR measurements on isotopically labeled glyphosate. The obtained van Vleckâs second moment is in favorable agreement with the value calculated based on the crystal structure.
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