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Threshold behaviour in photodetachment into a final state with large negative polarizability

Journal article
Authors Johan Rohlén
Anton Lindahl
Hannes Hultgren
R. D. Thomas
D. J. Pegg
Dag Hanstorp
Published in Epl
Volume 106
Issue 5
Pages Article Number: 53001
ISSN 0295-5075
Publication year 2014
Published at Department of Physics (GU)
Pages Article Number: 53001
Language en
Keywords IONS, Physics, Multidisciplinary
Subject categories Physical Sciences


In a recent experiment, Lindahl et al. (Lindahl A. O. et al., Phys. Rev. Lett., 108 (2012) 033004) observed a new threshold behavior in the photodetachment of the potassium negative ion when the residual atom is left in the 5 (2)G state. Unfortunately the resonance close to threshold made it more difficult to apply the semi-classical model that was developed to describe the threshold behavior. In this paper we present a study of the threshold behavior of the 5 (2)G partial cross-section in the photodetachment of the sodium negative ion. The experiment was conducted using a collinear beams apparatus where the detection was performed using a resonance ionization scheme. We observe the same threshold behavior as in the previous experiment, but without any obfuscating resonance. The model derived in the previous paper is found to fit the observed cross-section up to 35 meV above threshold. The present experiment clearly demonstrates the threshold behaviour for the fundamental process of a free electron moving in the field of an atom with a large negative polarizability. Copyright (C) EPLA, 2014

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