4.2 Author:
   Lee, Carolyn W. B.; Sanctuary, B. C.
Reference:
   Journal, JOMRA4, J.Magn.Reson., EN, 59, 2, 1984, 189-196
Title:
   Multipole NMR. VIII. Evidence for Multipole Echoes for I = 5/2
Abstract:
The multipole formulation of NMR is applied to a spin 5/2 in order to study the angle and phase dependence of the second rf pulse in the sequence (p/2)y1-t1-(b)y2-t2.It is shown that the experimental amplitudes of the echoes as a function of b for 127I in KI crystals observed by Weisman and Bennett agree well with the spin dynamic calculation presented here.Only a nuclear quasdrupole interaction is included in addition to the usual Zeeman terms.It is shown that by proper choice of b it is possible to suppress, or maximize, certain polarizations giving, for example at t2 = t1, a predominantly hexadecapole echo for b = 45 deg, y2 = 90, y1 = 0 in KI.