Consider another subset of the configurations of atomic cesium below along with their spin-orbit splitting, the magnitude of which increases as the spin-orbit interaction increases. Why does the magnitude of spin-orbit splitting decrease so much as Ω increases?
Configuration and Term Spin-orbit splitting (cm-1)
[Xe] 6p1,2Pu [Xe] 6d1,2Dg [Xe] 6f1,2Fu [Xe] 6g1,2Gg
554.04
42.87
0.1058
0.0016