Photoionization dynamics of polyatomic molecules
The work presented in this thesis was carried out with the ultimate aim of learning about the photoionization dynamics of polyatomic molecules. This is a complex problem; in order to obtain sufficient experimental data to shed light on the dynamics careful measurement of photoelectron angular distri...
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| Format: | Thesis (University of Nottingham only) |
| Language: | English |
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2009
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| Online Access: | https://eprints.nottingham.ac.uk/10857/ |
| _version_ | 1848791142625181696 |
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| author | Hockett, Paul |
| author_facet | Hockett, Paul |
| author_sort | Hockett, Paul |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | The work presented in this thesis was carried out with the ultimate aim of learning about the photoionization dynamics of polyatomic molecules. This is a complex problem; in order to obtain sufficient experimental data to shed light on the dynamics careful measurement of photoelectron angular distributions (PADs) is required. Ideally these measurements are rotationally-resolved, and the angular distributions measured correspond to the formation of the molecular ion in a single rotational state. The ionization event, in the dipole approximation, can be completely described by the dipole matrix elements. If sufficient experimental data to determine the radial components of the matrix elements and associated phases, the dynamical parameters, can be obtained the photoionization experiment may be said to be complete. Analysis of such experiments requires that the initial state of the molecular system is also known, to this end resonance-enhanced multi-photon ionization (REMPI) schemes can be used in order to populate a single quantum state prior to ionization. The experiments presented here follow this methodology, with various REMPI schemes used to prepare (pump) and ionize (probe) the molecule under study, and the velocity-map imaging (VMI) technique used to (simultaneously) record the photoelectron spectra and angular distributions.
Two molecules have been studied experimentally, acetylene (C2H2) and ammonia (NH3). In both cases dynamical parameters pertaining to the formation of specific states (vibronic or vibrational) of the molecular ion have been determined from experimental data. Additionally, in the ammonia work, rotationally-resolved photoelectron images were obtained. |
| first_indexed | 2025-11-14T18:23:49Z |
| format | Thesis (University of Nottingham only) |
| id | nottingham-10857 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T18:23:49Z |
| publishDate | 2009 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-108572025-02-28T13:18:54Z https://eprints.nottingham.ac.uk/10857/ Photoionization dynamics of polyatomic molecules Hockett, Paul The work presented in this thesis was carried out with the ultimate aim of learning about the photoionization dynamics of polyatomic molecules. This is a complex problem; in order to obtain sufficient experimental data to shed light on the dynamics careful measurement of photoelectron angular distributions (PADs) is required. Ideally these measurements are rotationally-resolved, and the angular distributions measured correspond to the formation of the molecular ion in a single rotational state. The ionization event, in the dipole approximation, can be completely described by the dipole matrix elements. If sufficient experimental data to determine the radial components of the matrix elements and associated phases, the dynamical parameters, can be obtained the photoionization experiment may be said to be complete. Analysis of such experiments requires that the initial state of the molecular system is also known, to this end resonance-enhanced multi-photon ionization (REMPI) schemes can be used in order to populate a single quantum state prior to ionization. The experiments presented here follow this methodology, with various REMPI schemes used to prepare (pump) and ionize (probe) the molecule under study, and the velocity-map imaging (VMI) technique used to (simultaneously) record the photoelectron spectra and angular distributions. Two molecules have been studied experimentally, acetylene (C2H2) and ammonia (NH3). In both cases dynamical parameters pertaining to the formation of specific states (vibronic or vibrational) of the molecular ion have been determined from experimental data. Additionally, in the ammonia work, rotationally-resolved photoelectron images were obtained. 2009-10-15 Thesis (University of Nottingham only) NonPeerReviewed application/pdf en arr https://eprints.nottingham.ac.uk/10857/1/thesis_final_21_07_09.pdf Hockett, Paul (2009) Photoionization dynamics of polyatomic molecules. PhD thesis, University of Nottingham. Ionization molecular physics physical chemistry spectroscopy acetylene ammonia |
| spellingShingle | Ionization molecular physics physical chemistry spectroscopy acetylene ammonia Hockett, Paul Photoionization dynamics of polyatomic molecules |
| title | Photoionization dynamics of polyatomic molecules |
| title_full | Photoionization dynamics of polyatomic molecules |
| title_fullStr | Photoionization dynamics of polyatomic molecules |
| title_full_unstemmed | Photoionization dynamics of polyatomic molecules |
| title_short | Photoionization dynamics of polyatomic molecules |
| title_sort | photoionization dynamics of polyatomic molecules |
| topic | Ionization molecular physics physical chemistry spectroscopy acetylene ammonia |
| url | https://eprints.nottingham.ac.uk/10857/ |