Electron energy loss spectra of inner-shell excitations of 2p electrons of argon are measured at an incident electron energy of 2500eV and scattering angles of 0°and 4°.The dipole-forbidden transitions of 2_...Electron energy loss spectra of inner-shell excitations of 2p electrons of argon are measured at an incident electron energy of 2500eV and scattering angles of 0°and 4°.The dipole-forbidden transitions of 2_(p3/2)^(-1)4p and 2_(p3/2)^(-1)5p are observed in the measured spectra and assigned based on the calculations of the Cowan code.The positions and line widths for the excitations of 2_(p3/2)^(-1)nl and 2_(p1/2)^(-1)nl(n≤5)of argon are determined.The present results show that the line widths of the electric quadrupole transitions of 2_(p3/2)^(-1)4p[5/2+3/2]_(2)and the electric monopole one of 2p_(3/2)^(-1)4p[1/2]0 are less than those of the dipole-allowed transitions.展开更多
The valence-shell excitations of nitrous oxide are studied by fast electron energy loss spectroscopy.From the spectra measured at 2.5keV and scattering angles of 3.5°-8.5°,it is found that the asymmetric pea...The valence-shell excitations of nitrous oxide are studied by fast electron energy loss spectroscopy.From the spectra measured at 2.5keV and scattering angles of 3.5°-8.5°,it is found that the asymmetric peak of the transition B 1△ can be well fitted by Haarhoff-Van der Linde function,while the symmetric peaks of the transitions of C1Π and D1∑+ can be well fitted by the Voigt function.The parameters of the peak profiles of B1△,C1Π and D1∑+,i.e.,their energy level positions and linewidths,are determined.With the aid of these parameters,the overlapping spectra measured at the low-energy electron impact can be deconvolved,which provides the possibility to determine the quantitative differential cross sections.The present results also show that the peak profiles of the transitions of B1△,C1Π and D1∑+ are independent of the momentum transfer.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 10734040,10874168 and 10979040the National Basic Research Program of China under Grant No 2010CB923301.
文摘Electron energy loss spectra of inner-shell excitations of 2p electrons of argon are measured at an incident electron energy of 2500eV and scattering angles of 0°and 4°.The dipole-forbidden transitions of 2_(p3/2)^(-1)4p and 2_(p3/2)^(-1)5p are observed in the measured spectra and assigned based on the calculations of the Cowan code.The positions and line widths for the excitations of 2_(p3/2)^(-1)nl and 2_(p1/2)^(-1)nl(n≤5)of argon are determined.The present results show that the line widths of the electric quadrupole transitions of 2_(p3/2)^(-1)4p[5/2+3/2]_(2)and the electric monopole one of 2p_(3/2)^(-1)4p[1/2]0 are less than those of the dipole-allowed transitions.
基金Supported by the National Natural Science Foundation of China under Grants Nos 10734040,10874168 and 10979040the National Basic Research Program of China under Grant No 2010CB923301the Research Fund for the Doctoral Program of Higher Education of China.
文摘The valence-shell excitations of nitrous oxide are studied by fast electron energy loss spectroscopy.From the spectra measured at 2.5keV and scattering angles of 3.5°-8.5°,it is found that the asymmetric peak of the transition B 1△ can be well fitted by Haarhoff-Van der Linde function,while the symmetric peaks of the transitions of C1Π and D1∑+ can be well fitted by the Voigt function.The parameters of the peak profiles of B1△,C1Π and D1∑+,i.e.,their energy level positions and linewidths,are determined.With the aid of these parameters,the overlapping spectra measured at the low-energy electron impact can be deconvolved,which provides the possibility to determine the quantitative differential cross sections.The present results also show that the peak profiles of the transitions of B1△,C1Π and D1∑+ are independent of the momentum transfer.
