Glauber cross sections for the2s→2presonance excitation in lithium by electron impact

The cross sections for the electron-impact-induced resonance transition ($2s\to 2p$) in lithium are calculated in the Glauber approximation using Franco's method of explicitly involving all the electrons of the many-electron target. Our results are always a bit smaller than the frozen Glauber results, but approach them as the energy increases. However, these differences are not very significant, indicating that the inner electrons (those in $1s$ state) are rather inert. Both of the Glauber results are found to be in good agreement above 15 eV with the recent experimental results of Leep and Gallagher.