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Optics Express

Optics Express

  • Editor: J. H. Eberly
  • Vol. 8, Iss. 7 — Mar. 26, 2001
  • pp: 401–410

Photoionization of atoms described by Fermi Molecular Dynamics: toward a firmer theoretical basis

K. J. LaGattuta  »View Author Affiliations

Optics Express, Vol. 8, Issue 7, pp. 401-410 (2001)

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The application of Fermi Molecular Dynamics (FMD) to the modeling of the photoionization of atoms by a short pulse of long wavelength laser radiation is examined in detail. Depression of the single ionization threshold to values of the electric field strength below the classical over-the-barrier threshold, a common occurrence in FMD, is shown to arise from the preexcitation of bound electrons into a continuum of unphysical low-lying excited states. A connection is made to analogous calculations performed with the quantum Hamilton-Jacobi equation, in which the time-dependent quantum potential (Q) plays a role similar to that played in FMD by the so-called Heisenberg potential (VH ). Replacement of VH by Q in the FMD equations of motion results in a large reduction in the number of excitations to unphysical bound states, while producing no essential change in the photoionization probability.

© Optical Society of America

OCIS Codes
(000.3860) General : Mathematical methods in physics
(020.4180) Atomic and molecular physics : Multiphoton processes
(260.3230) Physical optics : Ionization
(270.6620) Quantum optics : Strong-field processes

ToC Category:
Focus Issue: Laser-induced multiple ionization

Original Manuscript: February 6, 2001
Published: March 26, 2001

Kenneth LaGattuta, "Photoionization of atoms described by Fermi Molecular Dynamics: toward a firmer theoretical basis," Opt. Express 8, 401-410 (2001)

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