ONE-DIMENSIONAL NUTATION NUCLEAR-QUADRUPOLE RESONANCE SPECTROSCOPY FOR MEASUREMENT OF THE ELECTRIC-FIELD GRADIENT TENSOR-ASYMMETRY PARAMETER

A novel one-dimensional nuclear quadrupole resonance experiment to mea sure the asymmetry parameter of the electric field gradient tensor in polycrystalline specimens using nutation spectroscopy is reported. The complete data set, necessary for the reconstruction of the powder nut ation lineshape, is recorded in a single scan provided by a train of s hort and intense on-resonance radiofrequency pulses. A modified scheme is presented to deal with multiple well-resolved resonances to provid e a frequency selective nutation method. The technique is successfully demonstrated for the two Cl-35 resonances in cyanuric chloride. A red uction of 1 or 2 orders of magnitude in the data acquisition time, rel ative to the usual two-dimensional method, is achieved. (C) 1997 Ameri can Institute of Physics.