Precision Measurement of Strong Field Double Ionization of Helium

B. Walker, B. Sheehy, L. F. DiMauro, P. Agostini, K. J. Schafer, and K. C. Kulander
Phys. Rev. Lett. 73, 1227 – Published 29 August 1994
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Abstract

The production of He+ and He2+ by a 160 fs, 780 nm laser has been measured over an unprecedented 12 orders of magnitude in counting range. Enhanced double electron emission, called nonsequential (NS) ionization, was observed over an intensity range where the single ionization dynamics is evolving from multiphoton to pure tunneling. The NS yield is found to scale with the ac-tunneling rate for the neutral, even when tunneling is not the dominant ionization pathway. A rescattering mechanism fails to predict the observed NS threshold or magnitude.

  • Received 27 April 1994

DOI:https://doi.org/10.1103/PhysRevLett.73.1227

©1994 American Physical Society

Authors & Affiliations

B. Walker1, B. Sheehy1, L. F. DiMauro2, P. Agostini2, K. J. Schafer3, and K. C. Kulander3,4

  • 1Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973
  • 2Service Recherches sur les Surfaces et l'Irradiation de la Matière, Centre d'Etudes de Saclay, 91191 Gif Sur Yvette, France
  • 3Theoretical, Atomic and Molecular Physics, Lawrence Livermore National Laboratory, Livermore, California 94551
  • 4Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, Colorado 80309

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Vol. 73, Iss. 9 — 29 August 1994

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