Threshold Photodetachment in a Repulsive Potential

A. O. Lindahl, J. Rohlén, H. Hultgren, I. Yu. Kiyan, D. J. Pegg, C. W. Walter, and D. Hanstorp
Phys. Rev. Lett. 108, 033004 – Published 19 January 2012

Abstract

We report on the first experimental observation of a new threshold behavior observed in the 5G2 partial channel in photodetachment of K. It arises from the repulsive polarization interaction between the detached electron and the residual K(5G2) atom, which has a large negative dipole polarizability. In order to account for the observation in the K(5G2) channel, we have developed a semiclassical model that predicts an exponential energy dependence for the cross section. The measurements were made with collinear laser-ion beams and a resonance ionization detection scheme.

  • Figure
  • Received 20 July 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.033004

© 2012 American Physical Society

Authors & Affiliations

A. O. Lindahl1,*, J. Rohlén1, H. Hultgren1,2, I. Yu. Kiyan2, D. J. Pegg3, C. W. Walter4, and D. Hanstorp1,†

  • 1Department of Physics, University of Gothenburg, SE-412 96 Gothenburg, Sweden
  • 2Albert-Ludwigs-Universität, D-79104 Freiburg, Germany
  • 3Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 4Department of Physics and Astronomy, Denison University, Granville, Ohio 43023, USA

  • *anton.lindahl@physics.gu.se
  • dag.hanstorp@physics.gu.se

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Issue

Vol. 108, Iss. 3 — 20 January 2012

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