论文标题
自刺激的脉搏回声列车来自不均匀宽扩大的旋转合奏
Self-stimulated pulse echo trains from inhomogeneously broadened spin ensembles
论文作者
论文摘要
我们通过实验表明并从理论上描述传统的磁共振回波序列如何在不均匀扩展的旋转集合与谐振器耦合时如何导致自刺激的脉冲回波。子系统之间的有效强耦合确保第一个Hahn Echo可以充当旋转的重聚焦脉冲，从而导致自刺激的次要回声。在平均场理论的框架内，我们表明此过程可以持续多次，导致一系列回声。我们介绍了一个分析模型，该模型解释了第一个回声和数值结果的形状，该模型很好地解释了回声列车的实验观察到的形状和强度，并提供了对所涉及的集体效应的见解。
We show experimentally and describe theoretically how a conventional magnetic resonance Hahn echo sequence can lead to a self-stimulated pulse echo train when an inhomogeneously broadened spin ensemble is coupled to a resonator. Effective strong coupling between the subsystems assures that the first Hahn echo can act as a refocussing pulse on the spins, leading to self-stimulated secondary echoes. Within the framework of mean field theory, we show that this process can continue multiple times leading to a train of echoes. We introduce an analytical model that explains the shape of the first echo and numerical results that account well for the experimentally observed shape and strength of the echo train and provides insights into the collective effects involved.
