QCPMG using adiabatic pulses for faster acquisition of ultra-wideline NMR spectra

A previously reported quadrupolar spin-echo experiment using adiabatic pulses, which can achieve uniform excitation of quadrupolar nuclei across a wide bandwidth, has been extended to a QCPMG-like sequence exhibiting the same uniform, broadband excitation as the echo experiment but with the advantage of a significant increase in S/N. This WURST-QCPMG sequence is used to obtain static wideline (71)Ga (spin-3/2) and (91)Zr (spin-5/2) spectra with linewidths in excess of 500 kHz, on a standard probe at 9.4 T without any transmitter frequency or field adjustment. The sequence is also used to observe the (59)Co (spin-7/2) central transition and inner satellite transitions. (C) 2008 Elsevier B.V. All rights reserved.