Electron-Impact Ionization of Molecular Ions Y.-K. Kim, K.K. Irikura, M.A. Ali and W.M. Huo NIST; Howard Univ., Wash. DC; NASA Ames Res. Ctr., CA slightly modified form of the Binary-Encounter-Bethe (BEB) model is used to calculate electron-impact total ionization cross sections of N_2^+ and CD^+, and the modified BEB cross sections are in good agreement with available experimental data.