SAMOP 2023 – scientific programme
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A: Fachverband Atomphysik
A 12: Poster I
A 12.11: Poster
Tuesday, March 7, 2023, 16:30–19:00, Empore Lichthof
K-shell Photodetachment of Carbon, Oxygen and Silicon Anions — Alexander Perry-Sassmannshausen1, Alexander Borovik Jr.1, Ticia Buhr1, Angelika Hamann1, Simon Reinwardt2, Sebastian Stock3,4, Florian Trinter5,6, Michael Martins2, Stephan Fritzsche3,4,7, Alfred Müller1, and •Stefan Schippers1 — 1I. Physikalisches Institut, Justus-Liebig-Universität Gießen — 2Institut für Experimentalphysik, Universität Hamburg — 3Helmholtz-Institut Jena — 4Institut für Theoretische Physik, Friedrich-Schiller-Universität Jena — 5Institut für Kernphysik, Goethe-Universität, Franfurt am Main — 6Molecular Physics, Fritz-Haber-Institut der MPG, Berlin — 7GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt
Using the PIPE end-station at PETRA III, we have measured cross sections σm for multiple (m-fold) photodetachment of C− [1], O−[2], and Si− [3] in the photon energy ranges 280–1000 eV, 525–1500 eV, and 1830–1900 eV, respectively. All cross sections exhibit near-threshold resonances. For C− and O−, the cross section σ5 shows signatures of double-core hole formation, in addition. The measured threshold energies agree with results of atomic-structure calculations, which also treat the complex deexcitation cascades that set in after the initial creation of one or two inner-shell holes. [1] A. Perry-Sassmannshausen et al., Phys. Rev. Lett. 124, 083203 (2020). [2] S. Schippers et al., Phys. Rev. A 106, 013114 (2022). [3] A. Perry-Sassmannshausen et al., Phys. Rev. A 104, 053107 (2021).