Electron Impact K-shell Ionization Cross Sections at high energies

A simple modification of the empirical model of Deutsh \textit{et. al}. [1] by incorporating both the ionic [2] and relativistic corrections [3] is proposed for evaluating the electron impact K -shell ionization cross sections of neutral atomic targets. Present results for 30 atomic targets with atomic number Z=1 -- 92 for incident energies up to E=2 GeV, agree well with available experimental cross sections. Comparisons with other theoretical findings will also be presented at the conference. [1] H. Deutsh, K. Becker, T. D. Mark, Int. J. Mass Spect. \textbf{177}, 47 (1998). [2] M. A. Uddin, A. K. F. Haque, M. M. Billah, A. K. Basak, K. R. Karim, B. C. Saha, Phys. Rev. A \textbf{71}, 032715 (2005).; Phys. Rev. A \textbf{73}, 012708 (2006). [3] M. Gryzinski, Phys. Rev \textbf{138}, 336 (1965).