THE USE OF BAND FILTERING IN MULTIDIMENSIONAL NMR - EVALUATION OF 2 USER-FRIENDLY TECHNIQUES

The advantages of band-filtering schemes, based on the selection of an inversion profile, over selective 90 degrees excitation pulse are pre sented, The performances of two ''user-friendly'' methods based on suc h 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 an d is less sensitive to relaxation phenomena, especially those related to T-2. Moreover, the advantages of using high-power pulse-width-modul ated DANTE trains instead of low-power ''soft'' pulse are emphasized, In association with DANTE-Z or Spin Pinging, this alternative avoids t he tedious calibration of BURP pulses and amounts to the calibration o f a conventional pi/2 ''hard'' pulse. (C) 1995 Academic Press, Inc.