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The Dipole Response of an Ionization Threshold within Ultrashort and Strong Fields

Birk, Paul

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Abstract

In this work, the strong-field-modified dipole response at the ionization threshold of helium is studied. The dipole response is induced by an attosecond pulse in the extreme ultraviolet spectral range and is manipulated by an ultrashort and strong femtosecond pulse in the near-infrared. To probe the response, the transient absorption spectrum of helium is recorded for different time delays between both pulses and different intensities of the femtosecond pulse. From the spectra, the dipole response of the ionization threshold is reconstructed, which is linked to the dynamics of excited electrons with energies in the transition region from bound to free. To identify the underlying processes of light-matter interaction leading to the observed structures in the time and spectral domain, different quantum-mechanical model simulations are conducted. As a result, the measured dipole response reveals light-induced energy shifts of the photoelectron’s kinetic energy close to the parent ion, signatures for field-driven recollisions of a photoelectron into the parent ion, and a temporal amplitude and phase gating mechanism. With the latter, the build-up dynamics of complex spectral structures are temporally resolved, which are the time-dependent separation and line-shape modification of the doubly excited Rydberg series as well as the temporal build-up of the ionization threshold.

Dokumententyp: Dissertation
Erstgutachter: Pfeifer, Prof. Dr. Thomas
Ort der Veröffentlichung: Heidelberg
Tag der Prüfung: 9 Dezember 2020
Erstellungsdatum: 07 Jan. 2021 08:55
Erscheinungsjahr: 2020
Institute/Einrichtungen: Fakultät für Physik und Astronomie > Dekanat der Fakultät für Physik und Astronomie
Zentrale und Sonstige Einrichtungen > Max-Planck-Institute allgemein > MPI fuer Kernphysik
DDC-Sachgruppe: 530 Physik
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