Cross sections for K-shell ionization by electron impact

Electron‐impact single ionization cross sections of helium isoelectronic systems

“…Khare and Wadehra 45 calculated the K‐shell ionization of Ag atom within the framework of the plane‐wave Born approximation with corrections emanating from exchange, Coulomb, and relativistic effects, and longitudinal as well as transverse interactions of the virtual photons with atoms, which is the representation of the Breit interaction 44. Their calculations and the experimental data of K‐shell ionization from the compiled work of Long et al 46 show a similar increasing trend in cross sections (Fig. 2 of Ref.…”

Experimental Electron-Impact K-Shell Ionization Cross Sections

“…In addition, the data are of basic importance for a better understanding of the electron-atom interaction. In recent years, there have been many new and improved measurements of K -shell ionization cross sections; hence, it is opportune to update the database compiled by Long et al [2] about 10 years ago. In the present Table we have added many data which had not been included in the database of Long et al…”

“…For elements H and He, measurements are made of H + and He + ion or secondary electron numbers by crossed-beam techniques [15]. From the compilations of Long [2] and Joy [16,17], it is seen that up until 10 years ago experimental K -shell ionization cross sections by electron impact were scarce in the low energy region (i.e., U ≤ 4, where U is the reduced energy defined as the ratio between the incident electron energy and K -shell ionization energy) and discrepancies among such data from different experiments were apparent for some elements. In recent years, major progress with measurements in the low energy region has been made by Luo et al [6 -12].…”

“…[2], consistent fluorescence yields are used to normalize the tabulated values. Therefore, the K -shell ionization cross sections taken from original papers have all been reevaluated (with the exception of H, He, and elements measured with the energy-loss spectra method, because fluorescence yields are not involved in these measurements), using the K -shell fluorescence yields given by Bambynek [26] (for C, N, O, Ne, Ar, Ce, Nd, Sm, Gd, Ho, Er, Yb, W, Pt, Au, Pb, Bi, U) and Hubbell et al [27] (for other elements).…”

Empirical model for the electron impact K‐shell ionization cross section of atoms

“…KSI cross sections have been object of experimental and theoretical studies since 1940s 1. A comprehensive review of the experimental KSI data has been provided by Long et al 2. In the last decade, the demand for the cross‐section data has increased.…”