%0 Journal Article %T First Born Double Differential Cross-Section for Ionization of H (3d) by Incident Electron Impact %A Sushmita Banerjee %A Sunil Dhar %J Open Journal of Microphysics %P 67-77 %@ 2162-2469 %D 2024 %I Scientific Research Publishing %R 10.4236/ojm.2024.142005 %X Double differential cross section (DDCS) of First-Born approximation is calcu-lated for the ionization of metastable 3d-state hydrogen atoms by electron impact energy at 150 eV and 250 eV. A multiple scattering theory is applied in the present study. The present results are compared with the other related the-oretical results for the ionization of hydrogen atoms from different metastable states and ground-state experimental results. The findings demonstrate a strong qualitative agreement with the existing results. The obtained results have an extensive scope for further study of such an ionization process. %K Electron %K Ionization %K Cross-Section %K Scattering %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=133535