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Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics
Journal of Physics: Condensed Matter, Volume: 34, Issue: 34, Start page: 345901
Swansea University Authors: Helen Chadwick , Josh Cantin, Yosef Alkoby, Gil Alexandrowicz
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DOI (Published version): 10.1088/1361-648x/ac7765
Helium (3He) 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 mono...
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Helium (3He) 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 3He 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 3He spin-echo measurements.
Data availability statement: The data that support the findings of this study are available upon reasonable request from the authors.
helium spin-echo, atomic beams, surface scattering
Faculty of Science and Engineering
This work was funded by a European Commission, Horizon 2020 Framework Programme, H2020 Excellent Science, H2020 European Research Council Consolidator Grant No. 772228, and a Research Councils UK, Engineering and Physical Sciences Research Council New Horizons Grant Number EP/V048589/1.