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Differential measurement of electron ejection after two-photon two-electron excitation of helium

We report the measurement of the photoelectron angular distribution of two-photon single-ionization near the 2p2 1De double-excitation resonance in helium, benchmarking the fundamental nonlinear interaction of two photons with two correlated electrons. This observation is enabled by the unique combi...

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Main Authors: Straub, Michael (Author) , Ding, Thomas (Author) , Rebholz, Marc (Author) , Borisova, Gergana (Author) , Magunia, Alexander (Author) , Lindenblatt, Hannes (Author) , Meister, Severin (Author) , Trost, Florian (Author) , Wang, Yimeng (Author) , Palutke, Steffen (Author) , Braune, Markus (Author) , Düsterer, Stefan (Author) , Treusch, Rolf (Author) , Greene, Chris H. (Author) , Moshammer, Robert (Author) , Pfeifer, Thomas (Author) , Ott, Christian (Author)
Format: Article (Journal)
Language:English
Published: 28 October 2022
In: Physical review letters
Year: 2022, Volume: 129, Issue: 18, Pages: 1-6
ISSN:1079-7114
DOI:10.1103/PhysRevLett.129.183204
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.129.183204
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.129.183204
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Author Notes:Michael Straub, Thomas Ding, Marc Rebholz, Gergana D. Borisova, Alexander Magunia, Hannes Lindenblatt, Severin Meister, Florian Trost, Yimeng Wang, Steffen Palutke, Markus Braune, Stefan Düsterer, Rolf Treusch, Chris H. Greene, Robert Moshammer, Thomas Pfeifer, Christian Ott
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Summary:We report the measurement of the photoelectron angular distribution of two-photon single-ionization near the 2p2 1De double-excitation resonance in helium, benchmarking the fundamental nonlinear interaction of two photons with two correlated electrons. This observation is enabled by the unique combination of intense extreme ultraviolet pulses, delivered at the high-repetition-rate free-electron laser in Hamburg (FLASH), ionizing a jet of cryogenically cooled helium atoms in a reaction microscope. The spectral structure of the intense self-amplified spontaneous emission free-electron laser pulses has been resolved on a single-shot level to allow for post selection of pulses, leading to an enhanced spectral resolution, and introducing a new experimental method. The measured angular distribution is directly compared to state-of-the-art theory based on multichannel quantum defect theory and the streamlined R-matrix method. These results and experimental methodology open a promising route for exploring fundamental interactions of few photons with few electrons in general.
Item Description:Gesehen am 14.11.2022
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.129.183204

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