THE REDOR TRANSFORM - DIRECT CALCULATION OF INTERNUCLEAR COUPLINGS FROM DIPOLAR-DEPHASING NMR DATA

Rotational-echo double-resonance (REDOR) is a dipolar-dephasing NMR te chnique that provides measurement of dipolar couplings between nuclei in solids, and therefore allows calculation of internuclear distances. Time-domain REDOR dephasing signals do not oscillate in a periodic ma nner, and the analysis of frequency- and time-domain signals is compli cated when discrete or continuous distributions of couplings are prese nt. We introduce a new analytic transform method, analogous to a Fouri er transform, that produces resonances at the dipolar coupling frequen cies present in the REDOR signal, Computer simulations are used to dem onstrate and explore details of the REDOR transform.