Rotational echo double resonance spectroscopy

Rotational echo double resonance (REDOR) [86] is one of the most important techniques developed for solid-state NMR spectroscopy. The theory of REDOR is... 

REDOR rotational echo double resonance (NMR spectroscopy)... 

The most powerful tool to study the intermediate range order in amorphous Si/B/N/(C) networks is MAS-NMR spectroscopy including advanced double resonance techniques such as B- Si rotational echo double resonance (REDOR), Si- B] rotational echo adiabatic passage double resonance (REAPDOR), and C- B] REAPDOR. These methods utilize the heteronu-clear coupling between the observed nucleus and a nucleus in the second coordination sphere to get information about the internuclear distance of the two nuclei. 

S. Elbers, W. Stroiek, L. Koudelka, H. Eckert, Site connectivities in silver borophosphate glasses new results from B P and P B rotational echo double resonance NMR spectroscopy, Solid State Nucl. Magn. Reson. 27 (2005) 65-76. 

Only the longitudinal spin term is present in Eq. (14) and aU heteronuclear dipole-dipole coupling interactions commute in a multispin system making the analysis much more straightforward. One of the best known pulse sequences in solid-state NMR spectroscopy, the rotational-echo double-resonance NMR (REDOR) experiment [44], employs appropriately placed pulses to avoid averaging of the heteronuclear dipolar coupling interactions by MAS. REDOR has been used in numerous cases to extract precise dipolar couplings and the inventor. Prof Schaefer, was commemorated recently for his contributions to solid-state NMR spectroscopy [45]. 

D heteronuclear correlation (HETCOR) spectroscopy is a cornerstone technique for many assignment strategies and is the method of choice for distance measurements through time-oscillatory magnetization build-up curves, REDOR (rotational echo double resonance) dephasing curves or rotor-encoded SSB analysis. 

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