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Atomic Physics 7 pp 29–63Cite as

Atomic Physics with Relativistic Beams

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Abstract

The availability of a beam of H- ions with near-luminal velocity has enabled us to investigate photon-atom interactions at photon energies and electric field strengths presently beyond the scope of ordinary laboratory techniques. See Fig. 1. We have surveyed the entire photodetachment spectrum of H- from threshold for single electron detachment to well above the threshold for two-electron detachment. Embedded in the one-electron photodetachment continuum of H- are a series of doubly excited states, termed “resonances” since they are unstable against autodetachment into the continuum. The two most striking of these lie near the threshold for the production of H° (n = 2): a very narrow state just below the threshold, the “Feshbach” resonance, and a broader state lying just above the n = 2 threshold, the “shape” resonance. By means of Stark mixing, we have been able to use these 1P states to uncover nearby 1S and 1D states. Just below the threshold for H° (n = 3) production, we have found a prominent dip in the photodetachment cross section. This “Feshbach”-type state is accompanied by a narrower recursion lying between it and the n = 3 threshold. The single electron

We are studying a System moving with 84% the speed of light. Time is dilated and lengths are contracted by 1.853.

photodetachment total cross section above n = 3 shows no further distinctive features upon examination with our current resolution, although there is some evidence for structure below n = 4.

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Author information

Authors and Affiliations

  1. The University of New Mexico, Albuquerque, NM, 87131, USA

    H. C. Bryant, K. B. Butterfield, D. A. Clark & C. A. Frost

  2. Los Alamos Scientific Laboratory, Los Alamos, NM, 87545, USA

    J. B. Donahue, P. A. M. Gram, M. E. Hamm & R. W. Hamm

  3. The University of Connecticut, Storrs, CT, 06268, USA

    W. W. Smith

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  1. H. C. Bryant
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  6. P. A. M. Gram
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Editor information

Editors and Affiliations

  1. Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

    Daniel Kleppner

  2. Harvard University, Cambridge, Massachusetts, USA

    Francis M. Pipkin

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© 1981 Plenum Press, New York

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Bryant, H.C. et al. (1981). Atomic Physics with Relativistic Beams. In: Kleppner, D., Pipkin, F.M. (eds) Atomic Physics 7. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9206-8_2

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  • DOI: https://doi.org/10.1007/978-1-4615-9206-8_2

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4615-9208-2

  • Online ISBN: 978-1-4615-9206-8

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