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 the nS_(1/2),n = 3,...,9 states of the lithiumatom. Computational approach is based on the explicitly correlated Hylleraas functions with the analytic integration and recursion relations. Theoretical predictions for the ionization potential of n S_(1/2) states and transition energies nS_(1/2)→2S_(1/2) are compared to known experimental values for ~(6,7)Li isotopes.