Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics.
Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics.
复制标题
束自旋回波光谱中的多重回波及其对超快动力学测量的影响。
DOI：
10.1088/1361-648x/ac7765
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Chadwick H
中科院分区：
文献类型：
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作者：
Chadwick H
氦（3He）自旋回波是一种用于探测超快原子尺度表面动力学的强有力的实验技术。这些测量的分析通常是假设只有一个单一的自旋回波条件，预计产生一个恒定的信号，纯弹性散射，一个单调衰减的信号，准弹性散射和振荡的非弹性散射事件。在目前的工作中，我们表明，实际上有四个自旋回波，必须正确占，即使在弹性散射的情况下，这些额外的回波导致振荡，可能会被错误地解释为由于非弹性散射。我们证明，它是可以准确地模拟实验数据通过传播3 He通过测量的磁场剖面的设备，并考虑机器的几何形状，允许这些额外的回波的影响，从非弹性散射事件在未来的3 He自旋回波测量解开。
Helium (3 He) spin-echo is a powerful experimental technique used to probe ultra-fast atomic scale surface dynamics. The analysis of these measurements is typically performed assuming there is only a single spin-echo condition, expected to produce a constant signal for pure elastic scattering, a monotonically decaying signal for quasi-elastic scattering and oscillations from inelastic scattering events. In the present work, we show that there are in fact four spin-echoes which must be correctly accounted for, and that even in the case of elastic scattering these additional echoes lead to oscillations which could mistakenly be interpreted as being due to inelastic scattering. We demonstrate that it is possible to accurately simulate the experimental data by propagating the 3 He through the measured magnetic field profile of the apparatus and considering the geometry of the machine, allowing the effect of these additional echoes to be disentangled from inelastic scattering events in future 3 He spin-echo measurements.