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Studying molecule-surface interactions using magnetically manipulated molecular beams / YOSEF ALKOBY

Swansea University Author: YOSEF ALKOBY

DOI (Published version): 10.23889/SUthesis.62110

Abstract

Molecular beam techniques contribute crucial knowledge for a wide range of research fields and applications[1, 2]. The goal of this PhD thesis is to contribute to the development of the new magnetic molec-ular interferometry technique and use it to study fundamentally im-portant molecule-surface sys...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Alexandrowicz, Gil ; Chadwick, Helen
URI: https://cronfa.swan.ac.uk/Record/cronfa62110
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first_indexed 2022-12-02T12:01:56Z
last_indexed 2023-01-13T19:23:21Z
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spelling 2022-12-02T12:11:00.5656737 v2 62110 2022-12-02 Studying molecule-surface interactions using magnetically manipulated molecular beams 7dfd68d51e3707584a808f896edfbd1f YOSEF ALKOBY YOSEF ALKOBY true false 2022-12-02 Molecular beam techniques contribute crucial knowledge for a wide range of research fields and applications[1, 2]. The goal of this PhD thesis is to contribute to the development of the new magnetic molec-ular interferometry technique and use it to study fundamentally im-portant molecule-surface systems in their ground state. The thesis describes both surface scattering experiments and the development of new instrumentation and experimental methods which make this technique more powerful and insightful. The development, character-isation and testing of a new direct beam line, capable of magnetically analysing the molecular beam without scattering from a surface, is presented. This new addition to the instrument enables gathering important information about the composition and properties of the molecular beam and its response to magnetic fields. This type of infor-mation will be particularly crucial when extending the interferometry technique to molecules where the magnetic Hamiltonian is not well known. Scattering experiments of hydrogen beams from graphene, copper and salt surfaces were performed, gaining unique quantum in-formation about the scattering process. Using magnetic manipulation, we can characterise the different quantum rotational projection states of the molecules before and after scattering from a surface and detect subtle changes in the quantum state during the scattering event.Both the scattering and the direct beam experiments presented in the thesis, were analysed by solving the magnetic evolution quantum mechanically. The results show that the scattering of hydrogen from a lithium-fluoride (001) surface into different diffraction channels, is highly dependent on the rotational projection states, i.e. the orien-tation of the molecular rotation of the incident molecules. In con-trast, the specular scattering of flat copper, Cu(111), and graphene surfaces shows no obvious change in the rotational state populations upon scattering. Further helium and deuterium beams experiments are presented, enhancing our understanding of the molecular magnetic interferometer and validating our analysis methods. E-Thesis Swansea Quantum state resolved experiment, molecular beams, stereodynamic, ground state hydrogen 25 11 2022 2022-11-25 10.23889/SUthesis.62110 COLLEGE NANME COLLEGE CODE Swansea University Alexandrowicz, Gil ; Chadwick, Helen Doctoral Ph.D European Research Council (ERC), Grant number: 772228 2022-12-02T12:11:00.5656737 2022-12-02T11:58:59.3516782 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemistry YOSEF ALKOBY 1 62110__25992__84e91ea596814eb2acc1d00de5bf0385.pdf Alkoby_Yosef_PhD_Thesis_Final_Redacted_Signature.pdf 2022-12-02T12:07:47.8165606 Output 9503322 application/pdf E-Thesis – open access true Copyright: The author, Yosef Alkoby, 2022. true eng
title Studying molecule-surface interactions using magnetically manipulated molecular beams
spellingShingle Studying molecule-surface interactions using magnetically manipulated molecular beams
YOSEF ALKOBY
title_short Studying molecule-surface interactions using magnetically manipulated molecular beams
title_full Studying molecule-surface interactions using magnetically manipulated molecular beams
title_fullStr Studying molecule-surface interactions using magnetically manipulated molecular beams
title_full_unstemmed Studying molecule-surface interactions using magnetically manipulated molecular beams
title_sort Studying molecule-surface interactions using magnetically manipulated molecular beams
author_id_str_mv 7dfd68d51e3707584a808f896edfbd1f
author_id_fullname_str_mv 7dfd68d51e3707584a808f896edfbd1f_***_YOSEF ALKOBY
author YOSEF ALKOBY
author2 YOSEF ALKOBY
format E-Thesis
publishDate 2022
institution Swansea University
doi_str_mv 10.23889/SUthesis.62110
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 Molecular beam techniques contribute crucial knowledge for a wide range of research fields and applications[1, 2]. The goal of this PhD thesis is to contribute to the development of the new magnetic molec-ular interferometry technique and use it to study fundamentally im-portant molecule-surface systems in their ground state. The thesis describes both surface scattering experiments and the development of new instrumentation and experimental methods which make this technique more powerful and insightful. The development, character-isation and testing of a new direct beam line, capable of magnetically analysing the molecular beam without scattering from a surface, is presented. This new addition to the instrument enables gathering important information about the composition and properties of the molecular beam and its response to magnetic fields. This type of infor-mation will be particularly crucial when extending the interferometry technique to molecules where the magnetic Hamiltonian is not well known. Scattering experiments of hydrogen beams from graphene, copper and salt surfaces were performed, gaining unique quantum in-formation about the scattering process. Using magnetic manipulation, we can characterise the different quantum rotational projection states of the molecules before and after scattering from a surface and detect subtle changes in the quantum state during the scattering event.Both the scattering and the direct beam experiments presented in the thesis, were analysed by solving the magnetic evolution quantum mechanically. The results show that the scattering of hydrogen from a lithium-fluoride (001) surface into different diffraction channels, is highly dependent on the rotational projection states, i.e. the orien-tation of the molecular rotation of the incident molecules. In con-trast, the specular scattering of flat copper, Cu(111), and graphene surfaces shows no obvious change in the rotational state populations upon scattering. Further helium and deuterium beams experiments are presented, enhancing our understanding of the molecular magnetic interferometer and validating our analysis methods.
published_date 2022-11-25T04:21:28Z
_version_ 1763754417898651648
score 11.014224

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