TY  - GEN
ID  - heidok30260
TI  - Attosecond dynamics of strong-field generated ions
Y1  - 2021///
AV  - public
CY  - Heidelberg
N2  - The main topic of this thesis is the time-resolved study of the dynamics occurring during the strong-field ionization of atoms and its application to the advancement of attosecond science. Using attosecond transient absorption spectroscopy (ATAS) in the regime where the near-infrared pump and the extreme ultraviolet probe pulses overlap, sub-cycle structures in the buildup of xenon ion population are observed and analyzed. It is established that these structures can serve as a timing tool to track dynamics with attosecond precision, thereby opening up a new domain of measurement schemes based on ATAS. At the same time, the line shapes of the observed resonances are used to reveal the dynamics of the time-dependent dipole moment of the atoms during the strong-field ionization. The investigation of the phase of the dipole moment suggests that a strong-field induced modification of the configuration interaction and dipole couplings between bound and continuum states occurs through polarization of the system. This phenomenon calls for an extended analytical description of strong-field ionization in multi-electron systems beyond the single-active electron approximation that takes laser-induced polarization of the atom into account.
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/30260/
A1  - Hartmann, Maximilian David
ER  -