SPIN-DENSITY DESCRIPTION OF ROTATIONAL-ECHO DOUBLE-RESONANCE, TRANSFERRED-ECHO DOUBLE-RESONANCE AND 2-DIMENSIONAL TRANSFERRED-ECHO DOUBLE-RESONANCE SOLID-STATE NUCLEAR-MAGNETIC-RESONANCE

The spin density matrix formalism has been applied to rotational-echo double-resonance (REDOR), transferred-echo double-resonance (TEDOR) and two-dimensional (2D) TEDOR experiments in order to obtain an expression for the signal intensities. TEDOR spectra of N-15-labeled glycine were measured with different dipolar evolution times. 2D-TEDOR spectra were measured of doubly labeled glycine-2-C-13,N-15 and of N-15-labeled glycine. Both the TEDOR and the 2D-TEDOR spectra were readily obtained although the 2D-TEDOR experiment on N-15-labeled glycine used a lot of machine time. Even though the N-15-1-C-13 dipolar coupling is relatively small (200 Hz), the 1-C resonance can still be observed.