https://doi.org/10.1140/epjd/e2008-00219-7
H+ and He2+ impact single and double ionization of lead
1
Department of Physics, BRA Bihar University, Muzaffarpur 842001, Bihar, India
2
Professor's Colony, Aghoria Bazar, Muzaffarpur 842002, Bihar, India
Corresponding author: a lalan_jha@yahoo.com
Received:
28
December
2007
Revised:
14
July
2008
Published online:
9
January
2009
H+ and He2+ impact single and double ionization cross sections of ground state lead atoms have been calculated in the binary encounter approximation. Calculations of direct double ionization cross sections have been performed in the modified double binary encounter model. The accurate expressions of σΔE (cross-section for energy transfer ΔE) and Hartree-Fock velocity distributions for the target electrons have been used throughout the calculations. Contributions to double ionization from Auger effect following ionization of inner shells have been considered in the present work. Our H+ impact single and double ionization cross sections are in good agreement with the experimental observations. In calculations of He2+ impact cross sections, the present theoretical approach shows limited success in the experimentally investigated region (50–350 keV amu-1).
PACS: 34.50.Fa – Electronic excitation and ionization of atoms (including beam-foil excitation and ionization)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009