The K-Shell ionization cross sections of silver have been measured by electron impact.In order to overcome the difficulties in preparing a self-supporting thin target,a thin target with a thick substrate was used in o...The K-Shell ionization cross sections of silver have been measured by electron impact.In order to overcome the difficulties in preparing a self-supporting thin target,a thin target with a thick substrate was used in our experiments.The influence of electrons reflected from the substrate was corrected by means of a detailed calculation of electron transport.The path of the electrons passing through silver target of 31.2μg/cm^(2) was calculated by the EGS4 Monte Carlo program.This method of correction for the measurement is reported for the first time.展开更多
An empirical formula is proposed to describe the K-shell ionization cross sections by electron impact over a wide range of atomic numbers and overvoltages U(the ratio between the electron incident energy and the bindi...An empirical formula is proposed to describe the K-shell ionization cross sections by electron impact over a wide range of atomic numbers and overvoltages U(the ratio between the electron incident energy and the binding energy of the electrons in the K-shell).The study is based on the analysis of existing experimental data of K-shell ionization cross sections.The expression shows the results in good agreement with the data for Z<6 atoms as well as for 6≤Z≤79.展开更多
The K-shell ionization cross sections of Cr, Ni and Cu elements by 7.5-25 keV electron impact have been measured.The experimental data have also been compared with the theoretical predictions of the Hippler and Mayol-...The K-shell ionization cross sections of Cr, Ni and Cu elements by 7.5-25 keV electron impact have been measured.The experimental data have also been compared with the theoretical predictions of the Hippler and Mayol-Salvat models. In general, it seems that the Mayol-Salvat model can provide a better description to our experimental data.展开更多
Electron-induced Zn ionization cross sectionSj which are scarce,have been obtained from measurement of Ka x-ray emission at energies from near threshold to 25 keV.The influence of substrate of thin target on ionizatio...Electron-induced Zn ionization cross sectionSj which are scarce,have been obtained from measurement of Ka x-ray emission at energies from near threshold to 25 keV.The influence of substrate of thin target on ionization cross sections has been corrected by using the bipartition model of electron transport.The experimental results are satisfactory as compared with empirical formula of Green and Cosslett.展开更多
基金Supported by the key subject of science and technology of Chinese Education Ministry under Grant No.1999202.
文摘The K-Shell ionization cross sections of silver have been measured by electron impact.In order to overcome the difficulties in preparing a self-supporting thin target,a thin target with a thick substrate was used in our experiments.The influence of electrons reflected from the substrate was corrected by means of a detailed calculation of electron transport.The path of the electrons passing through silver target of 31.2μg/cm^(2) was calculated by the EGS4 Monte Carlo program.This method of correction for the measurement is reported for the first time.
基金Supported by the National Natural Science Foundation of China under Grant No.19874045.
文摘An empirical formula is proposed to describe the K-shell ionization cross sections by electron impact over a wide range of atomic numbers and overvoltages U(the ratio between the electron incident energy and the binding energy of the electrons in the K-shell).The study is based on the analysis of existing experimental data of K-shell ionization cross sections.The expression shows the results in good agreement with the data for Z<6 atoms as well as for 6≤Z≤79.
基金Supported by the National Natural Science Foundation of China under Grant No.19874045。
文摘The K-shell ionization cross sections of Cr, Ni and Cu elements by 7.5-25 keV electron impact have been measured.The experimental data have also been compared with the theoretical predictions of the Hippler and Mayol-Salvat models. In general, it seems that the Mayol-Salvat model can provide a better description to our experimental data.
基金Supported by the National Natural Science Foundation of China under Grant No.19874045.
文摘Electron-induced Zn ionization cross sectionSj which are scarce,have been obtained from measurement of Ka x-ray emission at energies from near threshold to 25 keV.The influence of substrate of thin target on ionization cross sections has been corrected by using the bipartition model of electron transport.The experimental results are satisfactory as compared with empirical formula of Green and Cosslett.
