Vibrational autodetachment of sulfur hexafluoride anions at its long-lifetime 
limit

Menk, Sebastian; Das, S.; Blaum, Klaus; Froese, Michael Wayne; Lange, Michael; Mukherjee, M.; Repnow, Roland; Schwalm, Dirk; von Hahn, Robert; Wolf, Andreas

doi:10.1103/PhysRevA.89.022502

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Vibrational autodetachment of sulfur hexafluoride anions at its long-lifetime limit

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Menk, Sebastian
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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Froese, Michael Wayne
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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

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

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Schwalm, Dirk
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Weizmann Institute of Science;

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von Hahn, Robert
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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http://link.aps.org/doi/10.1103/PhysRevA.89.022502
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Citation

Menk, S., Das, S., Blaum, K., Froese, M. W., Lange, M., Mukherjee, M., et al. (2014). Vibrational autodetachment of sulfur hexafluoride anions at its long-lifetime limit. Physical Review A, 89(2): 022502. doi:10.1103/PhysRevA.89.022502.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-1D13-7

Abstract

We have investigated the autodetachment of electrons from rovibrationally hot SF₆⁻ anions using a cryogenic ion-beam trap. Extremely low residual gas densities of 10⁴cm⁻³ provided undisturbed observation of the neutralization rates due to vibrational autodetachment (VAD) over almost five orders of magnitude and over times up to 100 ms. We successfully explain our experimental decay curves using statistical rate theory combined with electron attachment data and vibrational frequencies calculated for a C_4v -distorted SF₆⁻ . The unprecedented sensitivity of the experiment to the decay constants at the VAD threshold allows us to infer from the data the adiabatic electron affinity of SF₆ to be (0.91±0.07) eV and to confirm the recently predicted C_4v symmetry of SF₆⁻ .