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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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/423587 |
| Acceso en línea: | https://hdl.handle.net/2117/423587 |
| Access Level: | acceso abierto |
| Palabra clave: | Photonics Lasers LIED Tunneling ionisation Keldish parameter Multi-photon ionisation Fotònica Làsers Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica |
| Sumario: | 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. |
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