Open Journal of Microphysics, 2017, 7, 53-65 http://www.scirp.org/journal/ojm ISSN Online: 2162-2469 ISSN Print: 2162-2450 DOI: 10.4236/ojm.2017.73004 Sep. 30, 2017 53 Open Journal of Microphysics The Triple Differential Cross Sections for Electron Impact Ionization of Metastable 3s State Hydrogen Atoms with Exchange Effect Tania Noor 1* , Sunil Dhar 2 1 Department of Mathematics, Premier University, Chittagong, Bangladesh 2 Department of Mathematics, Chittagong University of Information and Technology, Chittagong, Bangladesh Abstract A final state wave function of multiple scattering theory developed by Das and seal is utilized in the present study to calculate the triple differential cross sec- tions (TDCS) for the ionization of metastable 3S state hydrogen atoms at in- cident electron energy of 250 eV with the exchange effects in the asymmetric coplanar geometry for various kinematic conditions. Our present calculation results are compared with the available hydrogenic ground state experimental data and other existing theoretical results. A good qualitative agreement is shown with those of compared results of the present study specifically with hydrogenic ground state experimental data and metastable 2S and 2P state with exchange effect results. These new results offer an extensive scope for experimental verification in such ionization process. Keywords Electron, Cross Sections, Ionization, Scattering 1. Introduction Bethe [1] was first introduced the theoretical non-relativistic studies for the atomic ionization problems. The triple differential cross-section (TDCS) in elec- tron hydrogen atom ionization collision has become increasingly interesting over the last four to five decades both theoretically and experimentally for relati- vistic [2]-[9] as well as for non-relativistic energies [10]-[21]. Triple differential cross-section (TDCS), measured in (e, 2e) coincidence experiment investigated first by Ehrhardt et al. [22] and Amaldi et al. [23]. After that many researchers have been successfully investigated such experiments in a large extent for ioniza- How to cite this paper: Noor, T. and Dhar, S. (2017) The Triple Differential Cross Sections for Electron Impact Ioniza- tion of Metastable 3s State Hydrogen Atoms with Exchange Effect. Open Journal of Microphysics, 7, 53-65. http://dx.doi.org/10.4236/ojm.2017.73004 Received: May 1, 2017 Accepted: September 26, 2017 Published: September 30, 2017 Copyright © 2017 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access