Elektron-Ion-Rekombination im kryogenen Speicherring CSR
Zusammenfassung der Projektergebnisse
The Cryogenic Storage Ring (CSR) operated by the Heidelberg Max Planck Institute for Nuclear Physics (MPIK) is an experimental facility that enables atomic and molecular collision studies under world-wide unique conditions. By cooling down its inner vacuum chamber to below 10 K an experimental environment is created that is characterized by extremely low residual radiation and particle densities. At the same time, the ion-optical layout of the electrostatic storage ring permits the storage of ions independent of their mass. The main focus of the CSR scientific program is on the chemistry in the interstellar medium. The present complementary project explored in how far the unique features of the CSR facility can be exploited for expanding electron-ion recombination experiments to classes of atomic and molecular particles, i.e., low-charged heavy atomic ions and fullerene ions, which cannot easily be investigated in conventional magnetic storage rings. In the course of the project, three different recombination experiments were performed with Ne2+, Xe3+ and C60+ ions, in this order. Ne2+ was chosen because of the availability of benchmark data from an experiment at a magnetic storage ring. The results obtained at the CSR agree well with these benchmark data. In addition, it could be demonstrated that the CSR provides access to highly excited Rydberg recombination resonances, which due to field ionization are not accessible at a magnetic storage ring. Having established that atomic recombination experiments at the CSR are feasible, a followup experiment with a first low-charged heavy atomic ion, i.e., Xe3+ , was conducted. Because of their genuine multi-electron character, such ions pose considerable challenges also for atomic theory. Corresponding state-of-the-art calculations were carried out in the MPIK theory division. The results agree only partly with the experimental findings, highlighting the need for experimental benchmarks to guide the further development of the multi-electron theoretical methods. These activities are timely since atomic cross sections for low-charged heavy ions are currently in the focus of astrophysical research in the context of neutron-star mergers and the ensuing kilonovae. Eventually, the first ever electron-ion recombination experiment with a fullerene ion was carried out with C60+ ions. In all previous experiments with smaller molecular ions, the energy transfer from the initially free electron to the molecule resulted in a molecular break-up. For C60+, nondissociative recombination of a molecular ion was observed for the first time.
Link zum Abschlussbericht
https://hdl.handle.net/21.11116/0000-0012-13D7-4
Projektbezogene Publikationen (Auswahl)
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Dielectronic recombination of Ne2+ at the Cryogenic Storage Ring, Spring meeting of the German Physical Society, Erlangen, Germany, March 14 – 18, 2022
L. W. Isberner, Z. Harman, Á. Kálosi, C. Krantz, D. Paul, S. Schippers, S. Singh & O.Novotný
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Dissociative recombination of internally cold CH+ molecules, 738. WE-Heraeus-Seminar “New Frontiers at Heavy Ion Storage Rings: From Atomic Collisions to Many-Body Systems”, Bad Honnef, Germany, June 20 – 24, 2022
D. Paul, M. Grieser, R. von Hahn, L. W. Isberner, Á. Kálosi, C. Krantz, H. Kreckel, D. Müll, D. A. Neufeld, D. W. Savin, S. Schippers, P. Wilhelm, A. Wolf, M. J. Wolfire & O. Novotný
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Electron-ion recombination at the Cryogenic Storage Ring, Annual Meeting of the LOEWE-Cluster ELEMENTS, Frankfurt, Germany, May 3 – 5, 2022
L. W. Isberner
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Experimental Determination of the Dissociative Recombination Rate Coefficient for Rotationally Cold CH+ and Its Implications for Diffuse Cloud Chemistry. The Astrophysical Journal, 939(2), 122.
Paul, Daniel; Grieser, Manfred; Grussie, Florian; von Hahn, Robert; Isberner, Leonard W.; Kálosi, Ábel; Krantz, Claude; Kreckel, Holger; Müll, Damian; Neufeld, David A.; Savin, Daniel W.; Schippers, Stefan; Wilhelm, Patrick; Wolf, Andreas; Wolfire, Mark G. & Novotný, Oldřich
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First dielectronic recombination measurements at the Cryogenic Storage Ring, 20th International Conference on the Physics of Highly Charged Ions (HCI 2022), Matsue, Japan, August 29 – September 3, 2022
L. W. Isberner, M. Grieser, R. von Hahn, Z. Harman, Á. Kálosi, Ch. H. Keitel, C. Krantz, D. Paul3, S. Singh, A. Wolf, S. Schippers & O. Novotný
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First Dielectronic Recombination Measurements at the Cryogenic Storage Ring, 738. WE-Heraeus-Seminar “New Frontiers at Heavy Ion Storage Rings: From Atomic Collisions to Many-Body Systems”, Bad Honnef, Germany, June 20 – 24, 2022
L. W. Isberner, M. Grieser, R. von Hahn, Z. Harman, Á. Kálosi, Ch. H. Keitel, C. Krantz, D. Paul, S. Singh, A. Wolf, S. Schippers & O. Novotný
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Dissociative recombination of ArH+ at the Cryogenic Storage Ring, Spring meeting of the German Physical Society, Hannover, Germany, Hannover, March 05 – 10, 2023
Á. Kálosi, M. Grieser, R. von Hahn, L. W. Isberner, D. Paul, D. W. Savin, S. Schippers, V. C. Schmidt, A. Wolf & O. Novotný
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Dissociative Recombination of Rotationally Cold OH+ and Its Implications for the Cosmic Ray Ionization Rate in Diffuse Clouds. The Astrophysical Journal Letters, 955(2), L26.
Kálosi, Ábel; Gamer, Lisa; Grieser, Manfred; von Hahn, Robert; Isberner, Leonard W.; Jäger, Julia I.; Kreckel, Holger; Neufeld, David A.; Paul, Daniel; Savin, Daniel W.; Schippers, Stefan; Schmidt, Viviane C.; Wolf, Andreas; Wolfire, Mark G. & Novotný, Oldřich
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Electron recombination of deuterated triatomic hydrogen ions at the Cryogenic Storage Ring, Laboratory Astrophysics in the Age of ALMA and JWST. (799. WE-Heraeus-Seminar), Heidelberg, Germany, September 18 – 21, 2023
A. Znotins, A. Faure, J. Forer, C. H. Greene, F. Grussie, L. W. Isberner, Á. Kálosi, V. Kokoouline, M. Pezzella, D. Müll, O. Novotný, D. Paul, D. W. Savin, S. Schippers, J. Tennyson, X. Urbain, A. Wolf & H. Kreckel,
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First dielectronic recombination measurements at the Cryogenic Storage Ring, Laboratory Astrophysics in the Age of ALMA and JWST. (799. WE-Heraeus-Seminar), Heidelberg, Germany, September 18 – 21, 2023
L. W. Isberner, M. Grieser, R. von Hahn, Z. Harman, Á. Kálosi, C. H. Keitel, C. Krantz, D. Paul, D. W. Savin, S. Singh, A. Wolf, S. Schippers & O. Novotný
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First dielectronic recombination measurements with low-charged heavy ions at the Cryogenic Storage Ring, Spring meeting of the German Physical Society, Hannover, Germany, Hannover, March 05 – 10, 2023
L. W. Isberner, M. Grieser, R. von Hahn, Z. Harman, Á. Kálosi, Ch. H. Keitel, C. Krantz, D. Paul, D. W. Savin, S. Singh, A. Wolf, S. Schippers & O. Novotný
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First dielectronic recombination measurements with low-charged heavy ions at the Cryogenic Storage Ring, The 9th International Workshop on Electrostatic Storage Devices, Rehovot, Isreal, May 14 – 18, 2023
L. W. Isberner, M. Grieser, R. von Hahn, Z. Harman, Á. Kálosi, Ch. H. Keitel, C. Krantz, D. Paul, D. W. Savin, S. Singh, A. Wolf, S. Schippers & O. Novotný
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Dissociative recombination of rotationally cold ArH⁺. Physical Review A, 110(2).
Kálosi, Ábel; Grieser, Manfred; Isberner, Leonard W.; Kreckel, Holger; Larson, Åsa; Neufeld, David A.; Orel, Ann E.; Paul, Daniel; Savin, Daniel W.; Schippers, Stefan; Schmidt, Viviane C.; Wolf, Andreas; Wolfire, Mark G. & Novotný, Oldřich
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Dissociative recombination of rotationally cold H2 D+ and D2 H+ ions at the Cryogenic Storage Ring, 24th European Conference on the Dynamics of Molecular Systems, Aarhus, Denmark, June 30 – July 05, 2024
A. Znotins, A. Faure, C. H. Greene, M. Grieser, F. Grussie, L. W. Isberner, Á. Kálosi, V. Kokoouline, D. Müll, O. Novotný, A. Oetjens, D. Paul, M. Pezzella, D. W. Savin, S. Schippers, J. Tennyson, X. Urbain, A. Wolf & H. Kreckel
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First dielectronic recombination measurements at the Cryogenic Storage Ring, Annual meeting of the ErUM- FSP APPA, Darmstadt, Germany, January 18 – 19, 2024
L. W. Isberner, M. Grieser, R. von Hahn, Z. Harman, A. Kalosi, C. H. Keitel, C. Krantz, D. Paul, D. W. Savin, S. Singh, A. Wolf, S. Schippers & O. Novotny
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Recombination of C60+ ions with free electrons. Annual German Labastro Meeting 2024, Ringberg Castle, Kreuth, Germany, September 25 – 29, 2024
L. W. Isberner, B. S. Choudhari, M. Grieser, F. Grussie, C. Krantz, H. Kreckel, V. Schmidt, A. Wolf, S. Schippers & O. Novotný
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Electron-ion recombination of low-charged heavy atomic ions at the Cryogenic Storage Ring. PhD thesis. Justus-Liebig-Universität Gießen
L. Isberner
