Kinetics of multiple ionization of rare-gas atoms in a circularly polarized laser field

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.