Journal Article

PUBDB-2024-06309

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Circular dichroism in multiphoton ionization of resonantly excited helium ions near channel closing

Wagner, R. ; Ilchen, M.CFEL*XFEL.EU*DESY* ; Douguet, N. ; Schmidt, P. ; Wieland, N.CFEL*Extern*XFEL.EU* ; Callegari, C. ; Delk, Z. ; Demidovich, A. ; Ninno, G. D. ; Fraia, M. D. ; Hofbrucker, J. ; Manfredda, M. ; Music, V.Extern*XFEL.EU* ; Plekan, O. ; Prince, K. ; Rivas, D. ; Zangrando, M. ; Grum-Grzhimailo, A. ; Bartschat, K. ; Meyer, M. (Corresponding author)Extern*XFEL.EU*

2024
Macmillan Publishers Limited, part of Springer Nature London

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Please use a persistent id in citations: doi:10.1038/s41598-024-75459-1  doi:10.3204/PUBDB-2024-06309

Abstract: The circular dichroism (CD) of photoelectrons generated by near-infrared (NIR) laser pulses usingmultiphoton ionization of excited He+ ions in the 3p (m = +1) state is investigated. The ions wereprepared by circularly polarized extreme ultraviolet (XUV) pulses. For circularly polarized NIR pulsesco- and counter-rotating relative to the polarization of the XUV pulse, a complex variation of the CD isobserved as a result of intensity- and polarization-dependent Freeman resonances, with and withoutadditional dichroic AC-Stark shifts. The experimental results are compared with numerical solutionsof the time-dependent Schrödinger equation to identify and interpret the pronounced variation of theexperimentally observed CD.

Note: Prof. Alexei N. Grum-Grzhimailo (Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia) has been part of the overall project agenda of the paper by Wagner et al. since 2014 and the data in this publication has been acquired in 2019. Prof. Grum-Grzhimailo provided calculations for the underlying FERMI proposal in 2018 and has since then not been further involved in the project. Since his contribution has concluded before the war started, we ask for permission to publish the paper with Prof. Alexei N. Grum-Grzhimailo as Co-author under the given affiliation.

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Contributing Institute(s):

1. The European XFEL Users (XFEL-User)
2. X-ray Atto-Chirality (CFEL-XAC)
3. FLASH Photonen-Diagnose und Steuerungen (FS-FLASH-D)
4. FS-Photon Science (FS-PS)
5. SQS (XFEL_E2_SQS)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. AIM, DFG project G:(GEPRIS)390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2024

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