On the orthogonality of initial and final states in (e,3e) and (gamma,2e) collisions

F. D. COLAVECCHIA, G. GASANEO AND K. V. RODRÍGUEZ

Roma, Italia

Congreso; Many particle spectroscopy of atoms, molecules, clusters and surfaces; 2006

Perturbative models have proven to be both accurate as well as reliable in the description of many different collision environments involving the multiple ionization of two electron atoms. In this perturbative regime, the initial and final states of the electronelectron nucleus system can be modeled with a variety of wave functions. The final states of the electronelectron nucleus system can be modeled with a variety of wave functions. The electronnucleus interaction can be easily represented in simple atoms (such as Helium) by a Coulomb potential, while the correlation between the electrons can be introduced in different ways. In the initial state, correlation has been included in a wide range of approximations, starting from simple perturbation models to Hylleraas functions of many parameters[1, 3, 4]. These functions usually provide a good qualitative agreement with experiments in (e,2e), (e,3e) and (gamma,2e) processes. However, many quantitative discrepancies remain, and although some of them have been pointed out before[5], many more need to be thoroughly analyzed. The electron nucleus interaction can be easily represented in simple atoms (such as Helium) by a Coulomb potential, while the correlation between the electrons can be introduced in different ways. In the initial state, correlation has been included in a wide range of approximations, starting from simple perturbation models to Hylleraas functions of many parameters[1, 3, 4]. These functions usually provide a good qualitative agreement with experiments in (e,2e), (e,3e) and (gamma,2e) processes. However, many quantitative discrepancies remain, and although some of them have been pointed out before, many more need to be thoroughly analyzed.