Piecewise static Hamiltonian for an atom in strong laser field

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We show that it is possible to use a piecewise constant Hamiltonian to describe the main features of the dynamics of an atom interacting with a laser field. In particular we show that using this approximation we are able to give a good description of the ionization signal, of the HHG spectra and of the attosecond pulses generated by the radiating electron. Finally, we give an explicit formula to evaluate the ionization rate in the time dependent laser field. This formula, which is a generalization of the Landau formula for the ionization rate of an atom in a static electric field, fairly well reproduces the numerical ionization rates for a broad range of laser frequency and intensity. The main advantage of this formula is that it can be used well beyond the limits of thequasi-static formula for the ionization rate of an atom.
Original languageEnglish
Pages (from-to)986-991
Number of pages6
JournalJournal of Modern Optics
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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