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Studying Quantum-state Resolved Molecule Surface Collisions / ALEXANDER BURDEN

Swansea University Author: ALEXANDER BURDEN

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Abstract

The interaction between molecular hydrogen and a surface is of vital importance to many areas of scientific research. Thus, understanding this interaction and being able to model it is very beneficial. The goal of this master’s thesis is to characterise the interaction of hydrogen scattering from a...

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Published: Swansea, Wales, UK 2023
Institution: Swansea University
Degree level: Master of Research
Degree name: MSc by Research
Supervisor: Alexandrowicz, Gil ; Chadwick, Helen
URI: https://cronfa.swan.ac.uk/Record/cronfa65827
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first_indexed 2024-03-12T16:14:00Z
last_indexed 2024-03-12T16:14:00Z
id cronfa65827
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spelling v2 65827 2024-03-12 Studying Quantum-state Resolved Molecule Surface Collisions 882b4f9b3751e5df8c275276aa60846b ALEXANDER BURDEN ALEXANDER BURDEN true false 2024-03-12 The interaction between molecular hydrogen and a surface is of vital importance to many areas of scientific research. Thus, understanding this interaction and being able to model it is very beneficial. The goal of this master’s thesis is to characterise the interaction of hydrogen scattering from a hydrogen passivated chromium(110) surface. The thesis will describe the surface scattering measurements as well as the techniques previously developed to allow for these measurements. The quantum mechanical state of the molecular hydrogen is coherently controlled both before and after the scattering with the surface to theoretically allow for extraction of the scattering matrix from this data, which completely describes the interaction. Scattering both under specular and diffraction channel conditions were described, with the scattering at specular conditions demonstrating that the surface appears as a mirror to the hydrogen under these conditions. However, due to the noise encountered when measuring the signal when scattered into the (0,1) diffraction channel, the results for the scattering matrix for this this measurement are not entirely conclusive. This thesis will demonstrate that the measured signals are still able to provide a benchmark for theoreticians modelling the interaction. We then explore the various possible results for the scattering matrix and the conclusions we can draw from these, such as the high probability that hydrogen molecules rotating as helicopters relative to the surface ( = ±1) are more likely to scatter into the (0,1) diffraction channel than those rotating as cartwheels ( = 0). A possible resolution to these variety of results is just examining the best fit result to the experimental data; this thesis will describe this result and also explore the extent to which this result can be regarded over other possible solutions. Finally various data treatment options such as frequency filtering will be investigated in attempt to clarify the results from our experimental data. E-Thesis Swansea, Wales, UK surface chemistry, gas-surface dynamics, molecular beam scattering 15 12 2023 2023-12-15 COLLEGE NANME COLLEGE CODE Swansea University Alexandrowicz, Gil ; Chadwick, Helen Master of Research MSc by Research ERC consolidator grant Not Required 2024-03-12T16:50:08.7096745 2024-03-12T16:09:53.6885900 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemistry ALEXANDER BURDEN 1 65827__29697__bbbc978ba16d4c46a4cb626af7c6092e.pdf Burden_Alexander_MSc_Research_Thesis_Final_Redacted_Signature.pdf 2024-03-12T16:36:27.2611485 Output 3727484 application/pdf E-Thesis – open access true Copyright: The author, Alexander Burden, 2023. Thesis is released under the terms of a Creative Commons Attribution-Share Alike (CC-BY-SA) license. true eng
title Studying Quantum-state Resolved Molecule Surface Collisions
spellingShingle Studying Quantum-state Resolved Molecule Surface Collisions
ALEXANDER BURDEN
title_short Studying Quantum-state Resolved Molecule Surface Collisions
title_full Studying Quantum-state Resolved Molecule Surface Collisions
title_fullStr Studying Quantum-state Resolved Molecule Surface Collisions
title_full_unstemmed Studying Quantum-state Resolved Molecule Surface Collisions
title_sort Studying Quantum-state Resolved Molecule Surface Collisions
author_id_str_mv 882b4f9b3751e5df8c275276aa60846b
author_id_fullname_str_mv 882b4f9b3751e5df8c275276aa60846b_***_ALEXANDER BURDEN
author ALEXANDER BURDEN
author2 ALEXANDER BURDEN
format E-Thesis
publishDate 2023
institution Swansea University
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 The interaction between molecular hydrogen and a surface is of vital importance to many areas of scientific research. Thus, understanding this interaction and being able to model it is very beneficial. The goal of this master’s thesis is to characterise the interaction of hydrogen scattering from a hydrogen passivated chromium(110) surface. The thesis will describe the surface scattering measurements as well as the techniques previously developed to allow for these measurements. The quantum mechanical state of the molecular hydrogen is coherently controlled both before and after the scattering with the surface to theoretically allow for extraction of the scattering matrix from this data, which completely describes the interaction. Scattering both under specular and diffraction channel conditions were described, with the scattering at specular conditions demonstrating that the surface appears as a mirror to the hydrogen under these conditions. However, due to the noise encountered when measuring the signal when scattered into the (0,1) diffraction channel, the results for the scattering matrix for this this measurement are not entirely conclusive. This thesis will demonstrate that the measured signals are still able to provide a benchmark for theoreticians modelling the interaction. We then explore the various possible results for the scattering matrix and the conclusions we can draw from these, such as the high probability that hydrogen molecules rotating as helicopters relative to the surface ( = ±1) are more likely to scatter into the (0,1) diffraction channel than those rotating as cartwheels ( = 0). A possible resolution to these variety of results is just examining the best fit result to the experimental data; this thesis will describe this result and also explore the extent to which this result can be regarded over other possible solutions. Finally various data treatment options such as frequency filtering will be investigated in attempt to clarify the results from our experimental data.
published_date 2023-12-15T16:50:04Z
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score 11.0267

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