HIGHLY CHARGED ARGON IONS BY HE+ AND HE++ IMPACT

C. C. MONTANARI; J. E. MIRAGLIA

Kielce

Congreso; 18th International Conference on the Physics of Highly Charged Ions (HCI); 2016

Jan Kochanowski University

The multiple ionization is a complex many-electron process where direct ionization and postcollisionalelectron emission contribute to the final charge state. Electron-electron correlationand changes in the target potential play a role [1]. For certain targets, such as He or even Ne,it may be decisive, for others as Kr or Xe it is negligible [2]. The intermediate cases deservedeeper study, this work is a step in this direction. We used the continuum distorted-wave eikonalinitial state [3] and the independent electron model to describe the multiple ionization of Arby He2+ and He+ in the energy range 0.1-10 Mev/amu, including Auger-like post collisionalionization (PCI). As shown in the Figure 1(a), the results agree well with the experimental dataat high energies where the PCI is the main contribution. At intermediate impact energies thedescription is also good but it tends to overestimate the triple and quadruple ionization data.We also compare with recent TDDFT calculations by Zhang et al [4], considering ionizationplus capture, Figure 1(b). These results are closer to the experimental measurements for tripleionization of Ar. Unfortunately, TDDFT values go up to 300 keV/amu. The extension to higherenergies would be very interesting. The Ar K and L-shell ionization cross sections are alsocalculated and compared with the experimental data available and with the ECPSSR values [5].