Laser-induced electron diffraction in the mixed Keldysh regime

Laser-induced electron diffraction (LIED) is a self imaging technique that relies on the ionisation of a molecule and the application of the Simple Man's model to trace the trajectories of the returning electrons. Subsequently, the electron comes back to the paren ion and produces a momentum ki...

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Bibliographic Details
Author: Gómez Fernández, Laura
Format: master thesis
Publication Date:2024
Country:España
Institution:Universitat Politècnica de Catalunya (UPC)
Repository:UPCommons. Portal del coneixement obert de la UPC
Language:English
OAI Identifier:oai:upcommons.upc.edu:2117/423587
Online Access:https://hdl.handle.net/2117/423587
Access Level:Open access
Keyword:Photonics
Lasers
LIED
Tunneling ionisation
Keldish parameter
Multi-photon ionisation
Fotònica
Làsers
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica
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oai_identifier_str oai:upcommons.upc.edu:2117/423587
network_acronym_str ES
network_name_str España
repository_id_str
spelling Laser-induced electron diffraction in the mixed Keldysh regimeGómez Fernández, LauraPhotonicsLasersLIEDTunneling ionisationKeldish parameterMulti-photon ionisationFotònicaLàsersÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::FotònicaLaser-induced electron diffraction (LIED) is a self imaging technique that relies on the ionisation of a molecule and the application of the Simple Man's model to trace the trajectories of the returning electrons. Subsequently, the electron comes back to the paren ion and produces a momentum kick. These pairs of cation-electron are detected and their momentum distribution is used to compute the molecular distances of the atoms within the molecule. This technique is done in a Keldys regime of (γ ≪ 1)). Nevertheless, to be in a low Keldysh regime may be experimentally challenging. We revisit this technique in an intermediate Keldysh regime (γ ∈ [0.6, 1]) where tunnel ionisation and multi-photon ionisation coexist, with a hydrogen-like molecule, simulating a low ionisation potential system. A trajectory-based method is used considering and neglecting the Coulomb potential, to test weather the Simple Man's model is able to accurately describe the energies of the returning and rescattered electrons. This theoretical investigation unveils the upcoming challenges of running LIED in this regime and sets a threshold for the cutoff energies of the returning and rescattering electrons. Finally, it concludes with a comparison of the two most conventional wavelengths used to run LIED and the errors induced when using this technique outside in the mixed Keldysh regime.Universitat Politècnica de CatalunyaBiegert, JensChirvi, Katharina20242024-07-2320252025-02-06master thesishttp://purl.org/coar/resource_type/c_bdccNAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/masterThesisapplication/pdfhttps://hdl.handle.net/2117/423587reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4235872026-05-27T15:37:01Z
dc.title.none.fl_str_mv Laser-induced electron diffraction in the mixed Keldysh regime
title Laser-induced electron diffraction in the mixed Keldysh regime
spellingShingle Laser-induced electron diffraction in the mixed Keldysh regime
Gómez Fernández, Laura
Photonics
Lasers
LIED
Tunneling ionisation
Keldish parameter
Multi-photon ionisation
Fotònica
Làsers
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica
title_short Laser-induced electron diffraction in the mixed Keldysh regime
title_full Laser-induced electron diffraction in the mixed Keldysh regime
title_fullStr Laser-induced electron diffraction in the mixed Keldysh regime
title_full_unstemmed Laser-induced electron diffraction in the mixed Keldysh regime
title_sort Laser-induced electron diffraction in the mixed Keldysh regime
dc.creator.none.fl_str_mv Gómez Fernández, Laura
author Gómez Fernández, Laura
author_facet Gómez Fernández, Laura
author_role author
dc.contributor.none.fl_str_mv Biegert, Jens
Chirvi, Katharina
dc.subject.none.fl_str_mv Photonics
Lasers
LIED
Tunneling ionisation
Keldish parameter
Multi-photon ionisation
Fotònica
Làsers
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica
topic Photonics
Lasers
LIED
Tunneling ionisation
Keldish parameter
Multi-photon ionisation
Fotònica
Làsers
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica
description Laser-induced electron diffraction (LIED) is a self imaging technique that relies on the ionisation of a molecule and the application of the Simple Man's model to trace the trajectories of the returning electrons. Subsequently, the electron comes back to the paren ion and produces a momentum kick. These pairs of cation-electron are detected and their momentum distribution is used to compute the molecular distances of the atoms within the molecule. This technique is done in a Keldys regime of (γ ≪ 1)). Nevertheless, to be in a low Keldysh regime may be experimentally challenging. We revisit this technique in an intermediate Keldysh regime (γ ∈ [0.6, 1]) where tunnel ionisation and multi-photon ionisation coexist, with a hydrogen-like molecule, simulating a low ionisation potential system. A trajectory-based method is used considering and neglecting the Coulomb potential, to test weather the Simple Man's model is able to accurately describe the energies of the returning and rescattered electrons. This theoretical investigation unveils the upcoming challenges of running LIED in this regime and sets a threshold for the cutoff energies of the returning and rescattering electrons. Finally, it concludes with a comparison of the two most conventional wavelengths used to run LIED and the errors induced when using this technique outside in the mixed Keldysh regime.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024-07-23
2025
2025-02-06
dc.type.none.fl_str_mv master thesis
http://purl.org/coar/resource_type/c_bdcc
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/423587
url https://hdl.handle.net/2117/423587
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universitat Politècnica de Catalunya
publisher.none.fl_str_mv Universitat Politècnica de Catalunya
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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