BROAD-BAND POLARIZATION-TRANSFER EXPERIMENTS FOR ROTATING SOLIDS

A new type of rotor-synchronized 'R/L-driven' polarization-transfer te chniques is introduced and is shown to lead to efficient rare spin pol arization transfer over a large range of chemical shifts. It is demons trated that polarization transfer can proceed via a zero- or double-qu antum mechanism depending on the design of the pulse sequence. It is s hown experimentally that R/L-driven polarization transfer can be obser ved not only in isotopically enriched compounds but also in natural ab undance (e.g C-13) samples.