Unimolecular processes in diatomic carbon anions at high rotational excitation

Schmidt, Viviane C.; Curík, Roman; Oncák, Milan; Blaum, Klaus; George, Sebastian; Göck, Jürgen; Grieser, Manfred; Grussie, Florian; von Hahn, Robert; Krantz, Claude; Kreckel, Holger; Novotný, Oldrich; Spruck, Kaija; Wolf, Andreas

doi:10.1103/PhysRevA.110.042828

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Unimolecular processes in diatomic carbon anions at high rotational excitation

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Schmidt, Viviane C.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum, Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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George, Sebastian
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Göck, Jürgen
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Grieser, Manfred
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Grussie, Florian
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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von Hahn, Robert
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Krantz, Claude
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Kreckel, Holger
Holger Kreckel, ASTROLAB - MPG-Gruppe im Anschluss an ERC Starting Grant, MPI for Nuclear Physics, Max Planck Society;

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Novotný, Oldrich
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Spruck, Kaija
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Wolf, Andreas
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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https://journals.aps.org/pra/pdf/10.1103/PhysRevA.110.042828
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Citation

Schmidt, V. C., Curík, R., Oncák, M., Blaum, K., George, S., Göck, J., et al. (2024). Unimolecular processes in diatomic carbon anions at high rotational excitation. Physical Review A, 110(4): 042828. doi:10.1103/PhysRevA.110.042828.

Cite as: https://hdl.handle.net/21.11116/0000-0010-0804-1

Abstract

On the millisecond to second time scale, stored beams of diatomic carbon anions C₂^⁢− from a sputter ion source feature unimolecular decay of yet unexplained origin by electron emission and fragmentation. To account for the magnitude and time dependence of the experimental rates, levels with high rotational and vibrational excitation are modeled for the lowest electronic states of C₂^⁢−, also including the lowest quartet potential. Energies, spontaneous radiative decay rates (including spin-forbidden quartet-level decay), and tunneling dissociation rates are determined for a large number of highly excited C₂^⁢− levels and their population in sputter-type ion sources is considered. For the quartet levels, the stability against autodetachment is addressed and recently calculated rates of rotationally assisted autodetachment are applied. Nonadiabatic vibrational autodetachment rates of high vibrational levels in the doublet C₂^⁢− ground potential are also calculated. The results are combined to model the experimental unimolecular decay signals. Comparison of the modeled to the experimental rates measured at the cryogenic storage ring facility CSR gives strong evidence that C₂^⁢− ions in quasistable levels of the quartet electronic states are the so far unidentified source of unimolecular decay.