https://doi.org/10.1140/epjd/e2012-20420-3
Regular Article
Double ionization of Ne5+ and Ne6+ ions by electron impact
1
Department of Physics, BRA Bihar University,
Muzaffarpur, 842001
Bihar,
India
2
Department of Physics, B.N.M. College, 811302
Barhiya,
India
3
Department of Physics, College of Commerce, 800020
Patna,
India
a e-mail: bnroy123@yahoo.co.in
Received:
18
July
2011
Received in final form:
8
December
2011
Published online:
17
May
2012
Theoretical studies of electron impact double ionization cross sections of Ne5+ and Ne6+ ions have been performed in the binary encounter approximation (BEA). Direct double ionization (DDI) has been investigated in the modified double binary encounter model. The K-shell ionization cross sections have been also calculated in the BEA to take into account the contributions to double ionization from the ionization-autoionization (IA) process. The effect of the Coulombic field of the target ion on the incident electron has been considered in the present work. Accurate expression of σΔE (cross section for energy transfer ΔE) and the Hartree-Fock (HF) velocity distributions for the target electrons have been used throughout the calculations. The present results are in overall moderate agreement with the experimental observations. Possible reasons behind the discrepancies between the theory and the experiment have been discussed.
Key words: Atomic and Molecular Collisions
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2012