Intense-Field Double Ionization of Helium: Identifying the Mechanism

M. Lein, E. K. U. Gross, and V. Engel
Phys. Rev. Lett. 85, 4707 – Published 27 November 2000
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Abstract

We present quantum mechanical calculations of the electron and ion momentum distributions following double ionization of a one-dimensional helium atom by ultrashort laser pulses (780 nm) at various intensities. The two-electron momentum distributions exhibit a clear transition from nonsequential to sequential double ionization. We provide strong evidence that rescattering is responsible for nonsequential ionization by calculating the momentum spectrum of the He2+ recoil ions—which we find in excellent agreement with recent experiments—and by analyzing the electronic center-of-mass motion via Wigner transforms.

  • Received 22 February 2000

DOI:https://doi.org/10.1103/PhysRevLett.85.4707

©2000 American Physical Society

Authors & Affiliations

M. Lein1,2, E. K. U. Gross2, and V. Engel1

  • 1Institut für Physikalische Chemie, Am Hubland, 97074 Würzburg, Germany
  • 2Institut für Theoretische Physik, Am Hubland, 97074 Würzburg, Germany

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Vol. 85, Iss. 22 — 27 November 2000

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