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primary topic: Multi-Sideband Photoelectron Interferometry in Argon and Helium

Multi-Sideband Photoelectron Interferometry in Argon and Helium
type: Article
abstract: This thesis explores the photoionization dynamics in atoms using phase-locked two-color pulses, a high-frequency extreme ultraviolet (XUV) and a low-frequency infrared (IR) pulse, with the focus on extending the understanding of the interaction between the IR field and the outgoing electrons. To achieve this, a multi-sideband RABBITT (reconstruction of attosecond beating by two-photon transitions) technique was developed. An attosecond-beamline is constructed which includes a femtosecond IR laser, a highorder harmonic generation module for producing XUV pulses, an interferometer, and a reaction microscope. The setup enables angle-differential and coincidence measurements of photoionization and photodissociation processes with attosecond precision in a pumpprobe configuration. The XUV pulse initiates the photoionization process, and the resulting photoelectron interacts with the IR field, exchanging several photons as it escapes the ionic potential. Depending on the combination of XUV and IR photon exchanges, and/or the angularmomentum channels involved, the photoelectrons can reach the same state via different quantum paths. The resulting signal in the photoelectron spectrum is the coherent superposition of all these distinct quantum paths, which oscillates as the temporal delay between the XUV and IR pulses varies, creating an interferogram. The recorded angle-differential photoelectron interferograms in helium and argon enable the extraction of information on the relative amplitudes and phases of the dipole transition matrix elements associated with the many-order continuum-continuum transitions. We compare the experimental results with ab initio theoretical calculations based on solving the time-dependent Schrodinger equation and use a few-level-model simulation to ¨ understand the impact of different parameters on the photoelectron interferogram and the extracted information.
date: 2023
author list: authors
type: EPrint
type: DoctoralThesisEPrint
is part of: repository
has document: Multi-Sideband Photoelectron Interferometry in Argon and Helium (PDF)
has document: Multi-Sideband Photoelectron Interferometry in Argon and Helium (Other)
subject: 530 Physik

Multi-Sideband Photoelectron Interferometry in Argon and Helium (PDF)
type: Document
has file: Thesis_DB_HD.pdf
has part: Thesis_DB_HD.pdf

Divya Bharti
type: Person
given name: Divya
family name: Bharti

Multi-Sideband Photoelectron Interferometry in Argon and Helium (Other)
type: Document
is version of: Multi-Sideband Photoelectron Interferometry in Argon and Helium (PDF)
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Multi-Sideband Photoelectron Interferometry in Argon and Helium (Other)
type: Document
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Multi-Sideband Photoelectron Interferometry in Argon and Helium (Other)
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Multi-Sideband Photoelectron Interferometry in Argon and Helium (Other)
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Multi-Sideband Photoelectron Interferometry in Argon and Helium (Other)
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primary topic: Multi-Sideband Photoelectron Interferometry in Argon and Helium

530 Physik
type: Concept
preferred label: 530 Physics @en