Integral cross section with magnetic sublevels and polarization degree of He-like Cl ions by electron impact

摘要

The Breit-Pauli R-matrix method with 17 fine-structure levels is used to calculate integral cross sections with magnetic sublevels for electron-impact excitation of He-like Cl ions from the ground state. The integral cross sections are obtained for transitions from the ground state to the fine-structure levels of all the excited states of the 1s2l (l=0,1) configurations. Polarization degrees for the w (1s(2) S-1(0)-1s2p P-1(1)), y (1s(2) S-1(0)-1s2p P-3(1)), and x (1s(2) S-1(0)-1s2p P-3(2)) lines of low and moderately charged He-like ions are also obtained for a systematic investigation of the atomic number dependence. Our results for the polarization degree of He-like Cl ions are found to be in excellent agreement with experimental and other theoretical results.