The multielectron tunneling ionization probabilities have been calculated for Ar and Kr atoms in circularly, polarized laser fields with the pulse durations of 50 fs and 5 fs. The channels of sequential, nonsequential ionization, and ionization with ionic core excitation (inelastic tunneling) have been taken into account. The calculated results demonstrate that many-body effects in tunneling, connected mostly with ionic core excitation, are very important for creation of Ar4+, Ar5+, Kr4+, and Kr5+ ions.
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