Electron impact ionization of beryllium isoelectronic ions

Abstract

The electron impact single ionization cross-sections on the Be, B +, C 2+, N 3+, O 4+, Ne 6+, Fe 22+ and U 88+ atomic targets, in the beryllium isoelectronic sequence (BIS), are calculated using the modified versions of simplified improved binary-encounter dipole model (siBED) [W.M. Huo, Phys. Rev. A 64 (2001) 042719]. The modified models, QIBED (with the ionic correction) and RQIBED (with both the ionic and relativistic corrections) [M.A. Uddin, A.K.F. Haque, A.K. Basak, B.C. Saha, Phys. Rev. A 70 (2004) 032706], are found to provide an excellent description of the experimental data for all the targets in BIS with the same generic values of the two parameters d 1 and d 2 in the models. The RQIBED results describe satisfactorily the assessed data of Be and its predictions for U 88+ account for well the experimental K-shell ionization data of Sn, with almost the same properties of the ionized orbit concerned, even up to around 2 MeV.