Ionization of a two-electron atom in a strong electromagnetic field
O. V. Ovodova, A. M. Popov, Olga V. Tikhonova
A one-dimensional model of a helium atom in an intense field of a femtosecond electromagnetic pulse has been constructed using the Hartree technique. “Exact” calculations have been compared to the approximations of “frozen” and “passive” electrons. A nonmonotonic dependence of the single-electron ionization probability on the radiation intensity has been detected. Minima in the ionization probability are due to multiphoton resonances between different atomic states due to the dynamic Stark effect. We suggest that the ionization suppression is due to the interference stabilization in this case.
Journal of Experimental and Theoretical Physics•Aug 1, 1997•2 citations