Search

L-shell production cross sections Lα, Lβ and Lγ 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.

The Lα, Lβ and Lγ x-ray production cross sections of Dy and Sm by electron impact are measured at energies from near threshold to tens of keV. In the experiments, thin targets with thick substrates are used. Meanwhile, the electron transport bipartition model is used to eliminate the influence of electrons reflected from the thick substrates on measurements. The measured x-ray production cross sections are also compared with the theoretical predictions by Gryzinski and McGuire.

A lower-energy electron beam has been directed on to a hafnium thin target with thick backing to investigate the process of L-shell ionization. By using a Si(Li) detector to count the x-rays from the L-subshell, the partial and total production cross sections and mean ionization cross sections versus electron energies have been deduced simultaneously (from threshold to 36 keV). The influence of the electron reflected from the backing on measurements has been corrected. The path of the electron multi-scattered in the target itself has also been calculated by using the Monte Carlo programme (EGS4). A comparison with both theoretical predictions is given.

L-shell partial production cross sections of Lα-, Lβ-, Lγ- rays by electron impact were measured by observing the counts of x-rays from an impacted thin tungsten target. The total production cross sections and mean ionization cross sections were deduced from the measured results. The electron beam energy range was found to be 11-36 keV. The influence of electrons reflected by the backing on ionization cross sections has been corrected. The experimental results agree well with the theoretical predictions. PACS: 34. 80. Dp, 32. 30. Rj

K-ionization cross sections of Mo and Fe by electron impact were measured by detecting characteristic x-ray emitted by thin solid film targets of known mass thickness with a Si (Li) detector. Reflection correction of a substrate was done by bipartition model of electron transport. The experimental results are compared with theoretical calculation and empirical formula calculation.