Ionization potential for excited S states of the lithium atom

摘要: Nonrelativistic, relativistic, quantum electrodynamic, and finite nuclear mass corrections to the energy levels are obtained for ${\mathit{nS}}_{1/2},n=3,\dots{},9$ states of lithium atom. Computational approach is based on explicitly correlated Hylleraas functions with analytic integration recursion relations. Theoretical predictions ionization potential ${\mathit{nS}}_{1/2}$ transition energies ${\mathit{nS}}_{1/2}\ensuremath{\rightarrow}2{S}_{1/2}$ compared known experimental values $^{6,7}\mathrm{Li}$ isotopes.