On the account of final state correlation in double ionization processes

We discuss the use of uncorrelated final state wave functions in calculations of double ionization processes. We show that in some physical situations such a simplified treatment can provide meaningful results. In particular, the prevalence of back-to-back emission in two-photon double ionization and even energy sharing between the photoelectrons make it possible to use uncorrelated final state wave functions for total integrated cross-section calculations. PACS. 32.80.Fb Photoionization of atoms and ions – 42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift – 32.80.Rm Multiphoton ionization and excitation to highly excited states