Abstract
Electron energy loss spectra of inner-shell excitations of 2p electrons of argon are measured at an incident electron energy of 2500 eV and scattering angles of 0° and 4°. The dipole-forbidden transitions of 2p−13/24p and 2p−13/25p 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 2p−13/2nl and 2p−11/2nl (n ≤ 5) of argon are determined. The present results show that the line widths of the electric quadrupole transitions of 2p−13/24p[5/2 + 3/2]2 and the electric monopole one of 2p−13/24p[1/2]0 are less than those of the dipole-allowed transitions.
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