Multiple ionization of Ar by He+ and He+2 ions at intermediate and high energies

C. C MONTANARI; J. E. MIRAGLIA

Fort Worth

Congreso; 24th International Conference on the Application of Accelerators in Research and Industry (CAARI 2016); 2016

University of North Texas, Sandia National Laboratories, y Los Alamos National laboratory

The multiple ionization is a complex many-electron process where direct ionization and post-collisionalelectron emission contribute to the final charge state. For certain targets, such as He or Ne, electronelectroncorrelation and changes in the target potential may be decisive at intermediate energies [1].For other targets as Kr or Xe it is negligible [2]. In this work we present the intermediate case ofmultiple ionization of Ar. We used the continuum distorted-wave eikonal initial state [3] and theindependent electron model to describe the multiple ionization of Ar by He and He in the energyrange 0.1-10 Mev/amu, including Auger-like post collisional ionization, which enhance the high energymultiple ionization cross sections via ionization of the inner shells. Our results agree well withthe experimental data at high energies where the PCI is the main contribution. At intermediate impactenergies the description is also good but it tends to overestimate the triple and quadruple ionizationdata. We also compare with recent TDDFT calculations [4]. The Ar K and L shell ionization crosssections are also calculated and compared with the experimental data available and with the ECPSSRvalues [5].[1] Schenk G and Kirchner T, Phys. Rev. A 91 052712 (2015)[2] Montanari et al, J. Phys. Conf. Series 388 012036 (2012)[3] Fainstein P D, Ponce V H and Rivarola R D, J. Phys. B: At. Mol. Opt. Phys. 21 287 (1988)[4] Zhang C L, Hong X H, Wang F, Wu Y, and Wang J G, Phys. Rev. A 87 032711 (2013)[5] Lapicki G, Nucl. Instrum. and Meth. Phys. Res. B 189 8 (2002)