K2 (4S-5S) ; 1,3Sg,u+

C6 C8 C10 Ref.
6.368[4] 1.632[7] 5.945[9] M. Marinescu and A. Dalgarno, Phys. Rev. A 52, 311 (1995)
6.276[4] 1.592[7] 5.993[9] F. Vigne-Maeder, Chem. Phys. 85, 139 (1984)