MEASUREMENT OF DIPOLAR INTERACTIONS BETWEEN SPIN-1 2 AND QUADRUPOLAR NUCLEI BY ROTATIONAL-ECHO, ADIABATIC-PASSAGE, DOUBLE-RESONANCE NMR/

A new solid-state MAS NMR experiment is described that recovers the di polar interaction between spin-1/2 nuclei and quadrupolar nuclei spin pairs. This technique combines the principles of rotational-echo, doub le-resonance (REDOR) NMR and transfer-of-populations-double-resonance (TRAPDOR) NMR. Dipolar evolution is driven by a REDOR-like pi-pulse tr ain applied to the spin-1/2 nuclei and by a single TRAPDOR-like adiaba tic-passage pulse applied to the quadrupolar nuclei.