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Charge distribution of He states, excited by electron capture in He+ (26 keV)-He collisions

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Abstract

Using anticrossing spectroscopy we investigated one-electron capture in He+ (26 keV) – He collisions. The intensity of the triplet line λ (1s4l 3D → 1s2p 3P) ≈ 447.2 nm emitted by the fast atoms was measured as a function of an external electric field in the collision volume varied from −30 kV/cm to +30 kV/cm. The radiative decay of excited He atoms in an almost field-free region outside the collision volume was observed. The highly asymmetric intensity function could be reproduced theoretically using the density-matrix formalism. It indicates that the excited He atoms are in a state with a highly forward-backward asymmetric charge distribution, immediately after the charge-exchange collision.

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Authors and Affiliations

  1. Institute of Experimental Physics, University of Gdańsk, ul. Wita Stwosza 57, 80-952, Gdańsk, Poland

    P. Kamiński & R. Drozdowski

  2. Institüt für Optik und atomare Physik, Technische Universität Berlin, Hardenbergstrasse 36, 10623, Berlin, Germany

    G. von Oppen

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  1. P. Kamiński
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  2. R. Drozdowski
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  3. G. von Oppen
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Kamiński, P., Drozdowski, R. & von Oppen, G. Charge distribution of He states, excited by electron capture in He+ (26 keV)-He collisions. Eur. Phys. J. Spec. Top. 222, 2293–2300 (2013). https://doi.org/10.1140/epjst/e2013-02008-9

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  • DOI: https://doi.org/10.1140/epjst/e2013-02008-9

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