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Electron impact M-subshell ionization of atoms at relativistic energies
This content has been downloaded from IOPscience. Please scroll down to see the full text. 2015 J. Phys.: Conf. Ser. 635 052080 (http://iopscience.iop.org/1742-6596/635/5/052080) View the table of contents for this issue, or go to the journal homepage for more
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XXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC2015) IOP Publishing Journal of Physics: Conference Series 635 (2015) 052080 doi:10.1088/1742-6596/635/5/052080
Electron impact M-subshell ionization of atoms at relativistic energies A. K. F. Haque1, M. Alfaz Uddin1, M. A. R. Patoary1, A. K. Basak1 and B. C. Saha2 1
2
Department of Physics, University of Rajshahi, Rajshahi-6205, Bangladesh Department of Physics, Florida A & M University, Tallahassee, Florida 32307, USA.
Synopsis We propose an extension of our recently modified simplified-improved-binary-encounter dipole (MUIBED) model [1] suitable even for relativistic energies. This new model (XMUBED) is applied to calculate the electron impact single M-subshell ionization cross-sections for atomic targets with various charges Z (79 ≤ Z ≤ 92). The parameters of the MUIBED model for the M-shell ionization calculations are modified to account well for fourteen atomic targets (between Au and U) for the inner M-subshell ionization cross sections.
Electron impact ionization cross section (EIICS) of inner subshells of atoms are required for different branches of physics, such as atomic physics, plasma physics, radiation physics, material analysis and astrophysics. While for the K-shell, L-shell (total) and Mshell (total) there are few calculations in literatures, but for L-subshell and M-subshell targets, very few calculations are available, to the best of our knowledge. Moreover, the huge demand in applications for the ionization cross sections cannot be fulfilled by generating a database either by experiment or by quantum mechanical theories. This void in data and demand can be best fulfilled by using simple-to-use model that predict reasonable accurate results for inner Msubshell ionization of atoms. In this work, we report such a model that describes experimental results with reasonable accuracy for a wide range of targets and energy with only two subshell dependent generalized parameters. In Figure 1. EIICS of U atom M-shell and its subshell (M1, M2, M3, M4 and M5) are shown as a function of incident electron energy. A comparison with experimental data [2, 3] and quantum results [4, 5] shows very good agreement with our calculated cross sections. Details of our results will be presented at the conference. E-mail:
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Figure 1. M-shell and M-subshell EIICS of U atom (a) U-MTot., (b) U-M1, (c) U-M2, (d) U-M3, (e) U-M4 and (f) U-M5. References [1] A. K. F. Haque et al 2011 Advances in Quantum Chemistry 61, 317. [2] A Moy et al 2014 J. Phys. B: At. Mol. Opt. Phys. 47, 055202. [3] D. H. H. Hoffmann et al 1979 Z. Phys. A 293, 187. [4] M. S. Pindzola 2014 Phys. Rev. A 90, 022708. [5] S.P. Khare and J.M. Wadehra 1996 Can. J. Phys. 74, 376.
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