BROAD-BAND, NARROW-BAND, AND PASSBAND COMPOSITE PULSES FOR USE IN ADVANCED NMR EXPERIMENTS

New composite pulses are derived and presented in a simple form where the overall flip angle remains a variable. Thus, composite pulses of o verall flip angle 45 degrees, 90 degrees, 135 degrees, 180 degrees, or , for example, 54.7 degrees, can be written down in a matter of second s. Composite pulses that, at exact resonance, exhibit either broadband , narrowband, or passband behavior with respect to the strength of the radiofrequency field are demonstrated. The performance of all these c omposite pulses remains satisfactory over a range of normalized resona nce offsets typical of H-1 NMR spectroscopy. The most significant feat ure of the new composite pulses presented in this paper, however, is t hat they can be used to replace a simple pulse at any point in an adva nced NMR experiment without further modification of the pulse sequence . (C) 1994 Academic Press, Inc.