A Theoretical Study of the Biselective Double Pulsed Field Gradient Spin-Echo NMR Experiment
Résumé
The application of a biselective radiofrequency pulse to a coupled homonuclear spin system produces effets that are exploited in liquid-state NMR experiments. The insertion of such an RF pulse in a double pulsed field gradient spin echo sequence results in a module for the biselective production of antiphase magnetization states. Biselectivity is obtained through cosine modulation of a singly selective pulse profile. A full description of the module behavior is possible by means of four parameters, among which two are related to a property that was named "pulse ellipticity". The theory is in good agreement with the experimental results and numerical simulations. It is thus possible to predict how a maximum of antiphase magnetization can be produced.
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