Home > Publications database > Nonlinear spectroscopy on an autoionizing two-electron resonance in intense, extreme ultraviolet fields at a free-electron laser > print

001     619959
005     20250123215705.0
024 7 _ |2 URN
|a urn:nbn:de:bsz:16-heidok-312094
037 _ _ |a PUBDB-2024-08050
041 _ _ |a English
100 1 _ |0 P:(DE-H253)PIP1029312
|a Aufleger, Lennart
|b 0
|e Corresponding author
|g male
245 _ _ |a Nonlinear spectroscopy on an autoionizing two-electron resonance in intense, extreme ultraviolet fields at a free-electron laser
|f 2019-02-02 - 2022-02-02
260 _ _ |b Heidelberg University Library
|c 2022
300 _ _ |a 119
336 7 _ |2 DataCite
|a Output Types/Dissertation
336 7 _ |2 ORCID
|a DISSERTATION
336 7 _ |2 BibTeX
|a PHDTHESIS
336 7 _ |0 2
|2 EndNote
|a Thesis
336 7 _ |0 PUB:(DE-HGF)11
|2 PUB:(DE-HGF)
|a Dissertation / PhD Thesis
|b phd
|m phd
|s 1737631518_194519
336 7 _ |2 DRIVER
|a doctoralThesis
502 _ _ |a Dissertation, Heidelberg University, 2022
|b Dissertation
|c Heidelberg University
|d 2022
520 _ _ |a In this work, the influence of intense extreme-ultraviolet (XUV) fields on helium is experimentally investigated. Therefore, XUV pulses from a free-electron laser (FEL) are combined with transient absorption spectroscopy (TAS) and explored with numerical quantum-mechanical simulations. A novel TAS beamline enables measurements on the prototypical atomic three-body system, helium, at the free-electron laser in Hamburg (FLASH). In particular, the energetically lowest two-electron resonance, 2s2p, with its asymmetric Fano absorption line shape is of interest. This bound state is embedded in the single-ionization continuum and thus represents an atomic interferometer. Its main property, the sensitivity to phase, is used in this work to detect manipulations induced by strong XUV pulses. In the experiments, a distortion of the absorption line is observed in the presence of highly intense XUV pulses. Firstly, the line shape’s symmetry change is investigated with a numerical few-level model simulation and found to be connected to the transient dressing of the excited state. Employing realistically modelled stochastic pulses, the investigation is extended to the line shape’s dependence on the pulse duration. Finally, the line broadening is explained by the model simulation and allows for disentangling the contributing mechanisms, two-photon absorption and the increased reversion to the ground state.
536 _ _ |0 G:(DE-HGF)POF4-6G2
|a 6G2 - FLASH (DESY) (POF4-6G2)
|c POF4-6G2
|f POF IV
|x 0
588 _ _ |a Dataset connected to DataCite
693 _ _ |0 EXP:(DE-H253)F-BL2-20150101
|1 EXP:(DE-H253)FLASH-20150101
|6 EXP:(DE-H253)F-BL2-20150101
|a FLASH
|f FLASH Beamline BL2
|x 0
700 1 _ |0 P:(DE-H253)PIP1010834
|a Pfeifer, Thomas
|b 1
|e Thesis advisor
700 1 _ |0 P:(DE-H253)PIP1006739
|a Wolf, Andreas
|b 2
|e Reviewer
856 4 _ |u http://www.ub.uni-heidelberg.de/archiv/31209
|y Restricted
856 4 _ |u https://bib-pubdb1.desy.de/record/619959/files/Dissertation_AuflegerL_Pv01.pdf
|y Restricted
856 4 _ |u https://bib-pubdb1.desy.de/record/619959/files/Dissertation_AuflegerL_Pv01.pdf?subformat=pdfa
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|y Restricted
909 C O |o oai:bib-pubdb1.desy.de:619959
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|a External Institute
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910 1 _ |0 I:(DE-HGF)0
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910 1 _ |0 I:(DE-HGF)0
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913 1 _ |0 G:(DE-HGF)POF4-6G2
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|3 G:(DE-HGF)POF4
|4 G:(DE-HGF)POF
|a DE-HGF
|b Forschungsbereich Materie
|l Großgeräte: Materie
|v FLASH (DESY)
|x 0
920 _ _ |l no
920 1 _ |0 I:(DE-H253)HAS-User-20120731
|k DOOR ; HAS-User
|l DOOR-User
|x 0
980 _ _ |a phd
980 _ _ |a VDB
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980 _ _ |a UNRESTRICTED

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