Abstract
A theoretical study of the ionization of hydrogen atoms as a result of the interaction with ultrashort external half-cycle pulses is presented. Total ionization probability and energy distributions of ejected electrons are calculated in the framework of the single distorted Coulomb-Volkov (CVA) and the doubly-distorted impulsive Coulomb-Volkov (ICV) approximations. Quantum and classical results are compared to the exact solution of the time dependent Schrödinger equation. We show that the ICV bears a considerable improvement to the CVA energy distribution in the low-energy region, where CVA fails.
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