Electron impact excitation of helium atom
Han Xiao-Ying†a), Zeng De-Lingb), Gao Xiangb), Li Jia-Mingb),d),e)
       
The total cross sections for [1s2]11S → [1s2s]21S transition calculated by the different methods including the partial wave method (labeled as “Exact”) and the FBA method (labeled as “FBA”).