Abstract
We have investigated atomic ionization dynamics in krypton with circularly polarized light from a Ti-Sapphire laser in the intensity regime between 1016 W cm−2 and 1018 W cm−2. We have measured the yields of highly charged ions stemming from the 4s and 3d shells. The objective of the present work is to investigate the applicability of the single-active-electron description for the ionization rates. We found that for intense laser pulses with 40 fs pulse width the dominant process in multiple ionization is pure sequential ionization. The different LS-terms of the ground state configurations of the intermediate ionic charge states do not have a measurable influence on the ionization. Under the assumption that the magnetic m-quantum numbers rearrange sufficiently fast between each ionization step we can apply a single-active-electron description based on the ionization rates from the Ammosov–Delone–Krainov (ADK) theory.
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