STUDY OF A SPIN 3/2 SYSTEM BY A SPIN-ECHO SEQUENCE .2.

The density matrix describing the evolution of a spin 3/2 system excited by a spin-echo sequence was calculated from the equilibrium state to the acquisition period by taking into account the first-order quadrupolar interaction during all the experiment and a local heteronuclear magnetic field term between the two pulses and during the acquisition period. The formation of an echo due to a satellite-transition at tau(4) = tau(2) and two echoes due to the central-transition at tau(4) = tau(2) and tau(4) = 3-tau(2) were predicted for any omega(Q)/omega(rf) ratio. Chlorine Cl-37 nucleus in a single crystal of NaCl was used as experimental verification.