Generating Spin Echoes with Pi-Pulses: More is Different

ORAL

Abstract

NMR spin echo measurements in several solids linked through the form of the homonuclear dipolar coupling are shown to defy conventional expectations of the delta-function pulse approximation. Multiple pi-pulse echo trains may either freeze-out or accelerate the decay of the signal, depending upon pi-pulse phase. Average Hamiltonian theory, combined with exact quantum calculations, reveal an intrinsic cause for these coherent phenomena: the dipolar coupling has a many-body effect during any real, finite pulse.

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Authors

  • Dale Li

    Yale University, Yale University, Department of Physics, Yale University Department of Physics

  • Anatoly Dementyev

    Yale University Department of Physics

  • Yanqun Dong

    Yale University, Yale University, Department of Physics, Yale University Department of Physics

  • Rona Ramos

    Yale University, Yale University, Department of Physics, Yale University Department of Physics

  • Sean Barrett

    Yale University, Yale University, Department of Physics, Yale University Department of Physics