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In conditions where the interaction betweeen an atom and a shorthigh-frequency extreme ultraviolet laser pulse is a perturbation, we show thata simple theoretical approach, based on Coulomb-Volkov-type states, can makereliable predictions for ionization. To avoid any additional approximation, weconsider here a standard case : the ionization of hydrogen atoms initially intheir ground state. For any field parameter, we show that the method providesaccurate energy spectra of ejected electrons, including many above thresholdionization peaks, as long as the two following conditions are simultaneouslyfulfilled : (i) the photon energy is greater than or equal to the ionizationpotential ; (ii) the ionization process is not saturated. Thus, ionization ofatoms or molecules by the high order harmonic laser pulses which are generatedat present may be addressed through this Coulomb-Volkov treatment.Comment: 19 pages including 5 figures and figure caption

Coulomb-Volkov approach of ionization by extreme-ultraviolet laser pulses in the subfemtosecond regime