Multiple differential electron spectra from detachment in collisions of 
30–300-keV anions with atoms and molecules

Schulz, M.; Herrmann, F.; Zhang, W.; Chicharro, D. V.; Dorn, A.; Grieser, M.; Grussie, F.; Kreckel, H.; Novotny, O.; Trost, F.; Wolf, A.; Pfeifer, T.; Schröter, C. D.; Moshammer, R.

doi:10.1103/PhysRevA.110.022818

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Multiple differential electron spectra from detachment in collisions of 30–300-keV anions with atoms and molecules

MPS-Authors

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Schulz, M.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Herrmann, F.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons250038

Zhang, W.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons265732

Chicharro, D. V.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Dorn, A.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30535

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

/persons/resource/persons37581

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

/persons/resource/persons30721

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

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

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Trost, F.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons31190

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

/persons/resource/persons30892

Pfeifer, T.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Schröter, C. D.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Moshammer, R.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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https://journals.aps.org/pra/pdf/10.1103/PhysRevA.110.022818
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Citation

Schulz, M., Herrmann, F., Zhang, W., Chicharro, D. V., Dorn, A., Grieser, M., et al. (2024). Multiple differential electron spectra from detachment in collisions of 30–300-keV anions with atoms and molecules. Physical Review A, 110(2): 022818. doi:10.1103/PhysRevA.110.022818.

Cite as: https://hdl.handle.net/21.11116/0000-000F-C637-4

Abstract

We have measured triple differential momentum distributions for electron detachment in collisions of 30- and 300-keV anions (C⁻ and S⁢i⁻) with atoms and molecules (He, Ar, and N₂). The entire angular range of the ejected electrons was covered. The binary encounter ring, well known from positive ion-atom collisions, was observed in most cases. In a quasifree-electron scattering model this structure represents elastic scattering of the active electron from the target. However, especially for the slowest projectiles, this model fails to reproduce the angular distributions. In this regime it is probably necessary to use quasimolecular models to describe the collision. Indications for a projectile cusp are observed, implying that excitation-induced dipole moments in the ion projectile may be important.