Journal Article

PUBDB-2026-00453

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Double to Tenfold M -shell Photoionization of Singly Charged Lanthanum Ions

Looshorn, M.Extern* ; Doehring, M.Extern* ; Hillenbrand, P.-M.Extern* ; Martins, M.Extern*XFEL.EU* ; Mueller, A.Extern* ; Reinwardt, S.Extern* ; Seltmann, J.XFEL.EU*DESY* ; Trinter, F.Extern*XFEL.EU* ; Wang, S.Extern* ; Sahoo, A. K. ; Fritzsche, S.Extern* ; Schippers, S. (Corresponding author)Extern*

2026
Institute of Physics Publ. London

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Please use a persistent id in citations: doi:10.3847/1538-4357/ae3089  doi:10.3204/PUBDB-2026-00453

Abstract: Using the photon-ion merged-beams technique at the PETRA\,III synchrotron light source, we have measured cross sections for double and up to tenfold photoionization of La$^{+}$ ions by a single photon in the energy range 820--1400~eV, where resonances and thresholds occur that are associated with the excitation or ionization of one $M$-shell electron. These cross sections represent experimental benchmark data for the further development of quantum theoretical methods, which will have to provide the bulk of the atomic data required for the modeling of nonequilibrium plasmas such as kilonovae. In the present work, we have upgraded the Jena Atomic Calculator (JAC) and pushed the state-of-the-art of quantum calculations for heavy many-electron systems to new limits. In particular, we have performed large-scale calculations of the La$^+$ photoabsorption cross section and of the deexcitation cascades, which set in after the initial creation of a $3d$ hole. Our theoretical results largely agree with our experimental findings. However, our theoretical product-ion charge state distributions are somewhat narrower than the experimental ones, which is most probably due to the simplifications necessary to keep the cascade calculations tractable.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Experimentebetreuung PETRA III (FS-PET-S)
3. Uni Hamburg (U HH)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20220443 (I-20220443) (I-20220443)
4. DFG project G:(GEPRIS)510114039 - Dissoziationsdynamik von rumpfniveauangeregten ionischen, molekularen Radikalen (510114039) (510114039)
5. DFG project G:(GEPRIS)509471550 - Dynamik photoionisations-induzierter Prozesse in laser-präparierten Molekülen in der Gasphase und der wässrigen Phase (509471550) (509471550)

Experiment(s):

1. PETRA Beamline P04 (PETRA III)

Appears in the scientific report 2026

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