The Use of Band Filtering in Multidimensional NMR. Evaluation of Two 'User-Friendly' Techniques

The advantages of band-filtering schemes, based on the selection of an inversion profile, over selective 90° excitation pulse are presented. The performances of two “user-friendly” methods based on such a scheme, DANTE-Z and Spin Pinging, are evaluated. As expected, the two methods give similar results, but, among other things, DANTE-Z is easier to implement on a “routine” spectrometer than Spin Pinging and is less sensitive to relaxation phenomena, especially those related toT2. Moreover, the advantages of using high-power pulse-width-modulated DANTE trains instead of low-power “soft” pulse are emphasized. In association with DANTE-Z or Spin Pinging, this alternative avoids the tedious calibration of BURP pulses and amounts to the calibration of a conventional π/2 “hard” pulse.