Eur. Phys. J. D (2012) 66: 116
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

Abstract

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 σ_ΔE (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.