L-Shell X-Ray Production Cross Sections of Au and Ir Atoms by Electron Impact near the Threshold Region

L-shell production cross sections L_α, L_β and L_γ for Au and Ir atoms have been measured by electron impact at incident electron energies of about one to three times of the threshold energy. The total production cross section and mean ionization cross section were obtained from the experimental results and by using mean fluorescence yield, respectively. The influence of electrons reflected from the substrate and multiple electron scattering inside the target have been corrected. The experimental results are compared with the existing measured results and the theoretical predictions.