REDOR with adiabatic dephasing pulses

The response of a spin 1/2 ensemble, at thermal equilibrium and experiencin g chemical shift anisotropy (CSA), to the application of adiabatic inversio n pulses has been studied under magic-angle spinning (MAS). Numerical simul ations and experimental studies on such systems, carried out under slow spi nning conditions, show that the response to adiabatic inversion pulses has much more favorable characteristics than the response to conventional recta ngular pulses. We have also explored the possibilities of employing adiabat ic 180 degrees pulses as dephasing pulses in rotational-echo double-resonan ce (REDOR) experiments. Our results show that it is indeed possible to empl oy such adiabatic inversion pulses conveniently in REDOR experiments to eli minate resonance offset and H-1 inhomogeneity effects which may arise from the usage of conventional rectangular 180 degrees pulses. (C) 2000 Academic Press.