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@PHDTHESIS{Magunia:612496,
      author       = {Magunia, Alexander},
      othercontributors = {Pfeifer, Thomas and Oberthaler, Markus},
      title        = {{T}ime-and-{E}nergy–{R}esolved {E}lectron {D}ynamics in
                      {A}toms and {M}olecules with {I}ntense {S}hort-{W}avelength
                      {L}ight},
      school       = {Heidelberg University},
      type         = {Dissertation},
      publisher    = {Heidelberg University Library},
      reportid     = {PUBDB-2024-05349},
      pages        = {136},
      year         = {2024},
      note         = {Dissertation, Heidelberg University, 2024},
      abstract     = {This thesis investigates the interaction of ultrashort,
                      extreme-ultraviolet (XUV) and soft x-ray laser pulses with
                      atoms and molecules in the gas phase. In total, the subject
                      is explored from four different perspectives, which are all
                      based on the short- lived–coherent electronic responses to
                      the laser pulses, and measured with transient absorption
                      spectroscopy. First, a theoretical study reveals how
                      transient energy shifts of electronic dressed states in
                      atoms driven by an intense XUV Free-Electron Laser (FEL)
                      lead to temporal dipole phase shifts and absorption-line
                      changes. Second, a follow-up study investigates the
                      electronic-population Rabi-cycles corresponding to the
                      absorption-line changes of the first study. A convolutional
                      neural network is employed to reconstruct the temporal
                      population dynamics from the simulated spectral absorption
                      modifications. The inversion from an absorption to an
                      emission line is described and a potential experimental
                      demonstration in helium is discussed. Third, dense gas
                      targets enable amplification of the otherwise improbable,
                      non-linear process of stimulated resonant inelastic x-ray
                      scattering (RIXS), as well as x-ray FEL propagation-based
                      spatial-spectral reshaping. To this end, a new experimental
                      setup is built and utilized in an x-ray FEL driven RIXS
                      experiment in dense neon gas. Fourth, a novel experiment
                      combining XUV pulses from high-order harmonic generation
                      (HHG) and XUV-FEL pulses is demonstrated by time-resolving a
                      photochemical reaction in molecular oxygen. An FEL pulse
                      initiates coupled nuclear-electronic dissociation pathways
                      from molecular oxygen ions, which are time-resolved on
                      femto- and picosecond time scales by identifying the
                      reaction products in the time-delayed HHG absorption
                      spectra. A FEL-photon-energy–resolved study of the
                      fragments is performed to compare findings from absorption
                      spectroscopy with kinetic energy release spectra recorded in
                      parallel with a reaction microscope.},
      keywords     = {530 Physics (Other)},
      cin          = {DOOR ; HAS-User},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {6G2 - FLASH (DESY) (POF4-6G2)},
      pid          = {G:(DE-HGF)POF4-6G2},
      experiment   = {EXP:(DE-H253)F-FL26-20150901},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:bsz:16-heidok-351662},
      doi          = {10.11588/HEIDOK.00035166},
      url          = {https://bib-pubdb1.desy.de/record/612496},
}