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Ionization of atoms by ultrashort one‐cycle electromagnetic pulses is considered. First‐order time‐dependent perturbation theory for derivation of ionization probability by pulses with various field profiles is used. Numerical calculations for hydrogen and xenon atoms are done. Strong field‐phase dependence of ionization probability is shown. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)