Abstract

The method of quasienergy states (QES) for describing a quantum system in the field of a monochromatic light wave is presented. The perturbation theory for QES and quasistationary (decay) QES is developed. Various methods of obtaining approximate Green functions of valence electrons in atoms used for numerical calculations of the multiphoton-transition cross sections are discussed. On the basis of the developed formalism the variation of the atomic spectrum in an intense field, the multiphoton ionization of atoms and the influence of the light field on electron-atom and atom-atom collision processes are examined.

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