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Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics

Helen Chadwick Orcid Logo, Josh Cantin, Yosef Alkoby, Gil Alexandrowicz Orcid Logo

Journal of Physics: Condensed Matter, Volume: 34, Issue: 34, Start page: 345901

Swansea University Authors: Helen Chadwick Orcid Logo, Josh Cantin, Yosef Alkoby, Gil Alexandrowicz Orcid Logo

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DOI (Published version): 10.1088/1361-648x/ac7765

Abstract

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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Published in: Journal of Physics: Condensed Matter
ISSN: 0953-8984 1361-648X
Published: IOP Publishing 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa60325
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spelling 2022-07-15T10:50:38.9584759 v2 60325 2022-06-26 Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics 8ff1942a68a875f00d473d51aa4947a1 0000-0003-4119-6903 Helen Chadwick Helen Chadwick true false e96e87cd360ed650de453c39b7836d30 Josh Cantin Josh Cantin true false 3ddda180e33166b4c459279027052f21 Yosef Alkoby Yosef Alkoby true false 1401818466c1114ae2035b811568a38e 0000-0003-3203-5577 Gil Alexandrowicz Gil Alexandrowicz true false 2022-06-26 CHEM 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. Journal Article Journal of Physics: Condensed Matter 34 34 345901 IOP Publishing 0953-8984 1361-648X helium spin-echo, atomic beams, surface scattering 22 6 2022 2022-06-22 10.1088/1361-648x/ac7765 Data availability statement: The data that support the findings of this study are available upon reasonable request from the authors. COLLEGE NANME Chemistry COLLEGE CODE CHEM Swansea University 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. 2022-07-15T10:50:38.9584759 2022-06-26T21:13:13.2836110 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemistry Helen Chadwick 0000-0003-4119-6903 1 Josh Cantin 2 Yosef Alkoby 3 Gil Alexandrowicz 0000-0003-3203-5577 4 60325__24610__70478f8dc6bb43e88de5484ee342e106.pdf 60325.pdf 2022-07-15T10:49:08.4478550 Output 3264706 application/pdf Version of Record true Released under the terms of the Creative Commons Attribution 4.0 license. true eng http://creativecommons.org/licenses/by/4.0/
title Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics
spellingShingle Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics
Helen Chadwick
Josh Cantin
Yosef Alkoby
Gil Alexandrowicz
title_short Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics
title_full Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics
title_fullStr Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics
title_full_unstemmed Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics
title_sort Multiple echoes in beam spin-echo spectroscopy and their effect on measurements of ultra-fast dynamics
author_id_str_mv 8ff1942a68a875f00d473d51aa4947a1
e96e87cd360ed650de453c39b7836d30
3ddda180e33166b4c459279027052f21
1401818466c1114ae2035b811568a38e
author_id_fullname_str_mv 8ff1942a68a875f00d473d51aa4947a1_***_Helen Chadwick
e96e87cd360ed650de453c39b7836d30_***_Josh Cantin
3ddda180e33166b4c459279027052f21_***_Yosef Alkoby
1401818466c1114ae2035b811568a38e_***_Gil Alexandrowicz
author Helen Chadwick
Josh Cantin
Yosef Alkoby
Gil Alexandrowicz
author2 Helen Chadwick
Josh Cantin
Yosef Alkoby
Gil Alexandrowicz
format Journal article
container_title Journal of Physics: Condensed Matter
container_volume 34
container_issue 34
container_start_page 345901
publishDate 2022
institution Swansea University
issn 0953-8984
1361-648X
doi_str_mv 10.1088/1361-648x/ac7765
publisher IOP Publishing
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemistry{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemistry
document_store_str 1
active_str 0
description 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.
published_date 2022-06-22T04:18:21Z
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