Charge Exchange and X-ray Emission Cross Sections for Multiply-Charged Ions Colliding with Water

R. E. OLSON AND S. OTRANTO

Fort Worth, Texas, USA

Conferencia; 20th International Conference on the Application of accelerators in Research and Industry; 2008

University of North Texas and Sandia National Laboratory (USA)

Total and state selective nl-electron capture cross sections will be presented for highly charged ions Z = 4-10, 14, 18 and 26 colliding with water molecules. The energy range investigated was from 10 eV/amu (v = 0.02 a.u.) to 100 keV/amu (v = 2 a.u.). An initialization for the 1B1 and 3A1 orbitals of the water molecule is introduced based on the one center expansion of Moccia. The Z-dependence of the calculated total cross sections is in reasonable agreement with the recent data of Mawhorter et al [Phys. Rev. A 75, 032704 (2007)]. The energy dependence of the n- and l-level populations is investigated. The K-shell x-ray emission cross sections are determined by using the calculated state-selective electron capture results as input and then applying hydrogenic branching and cascading values for the photon emission. Our results compare favorably with experimental data from the KVI -Groningen, Jet Propulsion Laboratory and Lawrence Livermore National Laboratory groups. Double electron capture calculations are presented for the O6+ system. The resulting cross sections indicate the importance of multiple electron capture, followed by Auger decay, in the single capture spectra. *Work at UNS supported by PGI 24/F038 and PICTR 03/0437 of the ANPCyT (Argentina). Work at UMR supported by the Office of Fusion Energy Sciences, DOE