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Multiple Ionisation of Atoms in Intense Laser Fields

  • P. Agostini
  • A. L’Huillier
  • G. Petite
Part of the Nato ASI Series book series (NSSB, volume 143)

Abstract

Interaction of strong laser beams with atoms results in multiphoton excitation and ionisation (MPI), i.e bound-bound and bound-free transitions involving the simultaneous absorption of several photons. Such processes have been quite well described within the framework of time-dependent perturbation theory and single-electron approximation1. The validity of the latter is expected to be very good for alkali atoms, but is clearly questionable for alkaline-earth atoms, in which the two outermost electrons can be strongly correlated so that both are expected to participate to the interaction. Of course, it is even more questionable for rare gases, in spite of several MPI experimental results which do not contradict the prediction of the one-electron approximation. Multiple ionisation in MPI, recently discovered for both alkaline-earth atoms2 and rare gases3 is an obvious manifestation of the multi-electron nature of these atoms. This collision-free process has now been reported in wide ranges of intensity (1011 W.cm−2-1017 W.cm−2) and of wavelengths (193 nm-10000 nm). It can require the absorption of hundreds of photons (triple ionisation of Xe at 10000 nm4) and, at very high intensity and short wavelength, it can go along with inner-shell excitations (Auger lines have been reported in photoelectron spectra5) Such processses are obviously far from being completely understood and the theoretical approaches are still unpolished. The aim of this paper is to briefly review the most significant experiments and the available theoretical methods in this field.

Keywords

Multiphoton Ionization Double Ionisation Multiple Ionisation Multiphoton Process Intense Laser Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1986

Authors and Affiliations

  • P. Agostini
    • 1
  • A. L’Huillier
    • 1
  • G. Petite
    • 1
  1. 1.Service de Physique des Atomes et des SurfacesCEN SaclayGif sur Yvette CedexFrance

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