BOUND ELECTRON STATES ROLE IN THE IONIZATION OF ATOMS

S. BORBÉLY; D. G. ARBÓ; M. S. GRAVIELLE; K. TÕKÉSI; J. E. MIRAGLIA; L. NAGY

Salamanca, España

Conferencia; 10th European Conference on Atoms, Molecules and Photons; 2010

In the present work we have investigated the ionization of the hydrogen atom by ultrashort UV laser pulses. In the theoretical description of the atomic ionization the Coulomb-Volkov (CV) models [1] are considered to be efficient tools, however, it was recently shown [2,3] that they fail to provide accurate results when the resonant bound electron states play an important role in the ionization dynamics. To eliminate this deficiency, the CV models were improved, and the ionization probability amplitude was corrected by considering the ionization of electrons from excited bound states, too. In these improved models the occupation probability of the excited bound states are calculated using approximate methods (first order time-dependent perturbation theory [1] - MCV2- model, or close-coupling calculations [2] - CC-CV2- model). These further approximations limit the applicability of the models, when the field intensity is high, or the overall ionization rate is high.