Abstract
Pulsed spin locking in nuclear quadrupole resonance (NQR) is analyzed within the framework of Floquet theory. This produces an effective Hamiltonian to which the techniques of statistical mechanics can be applied and the equilibrium properties of the system explored. Under the Ostroff-Waugh pulse sequence, the magnetization rapidly evolves to a quasistationary state. This state subsequently decays slowly to equilibrium. The behavior of the magnetization with respect to pulse angle, pulse spacing, and resonance offset is analogous to the NMR case. The major differences are the dependence of the results on the orientation of the quadrupole principal axes with respect to the laboratory frame and the additional dipole interaction terms that arise in the three-level system. The results are compared both to NQR experiments and the analogous NMR experiments.
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