The electric dipole polarizabilities and hyperpolarizabilities for the lithium isotopes ${}^6\text{L}\text{i}$ and ${}^7\text{L}\text{i}$ in the ground state $2{}^{2}S$ and the excited states $2{}^{2}P$ and $3{}^{2}D$, as well as the leading resonance and dispersion long-range coefficients for the $\text{Li}\left(2{}^{2}S\right)\text{−}\text{Li}\left(2{}^{2}S\right)$ and $\text{Li}\left(2{}^{2}S\right)\text{-Li}\left(2{}^{2}P\right)$ systems, are calculated nonrelativistically using variational wave functions in Hylleraas basis sets. Comparisons are made with published results, where available. We find that the value of the second hyperpolarizability of the $2{}^{2}S$ state is sensitive to the isotopic mass due to a near cancellation between two terms. For the $3{}^{2}D$ state polarizability tensor, the calculated components disagree with those measured in the sole experiment and with those calculated semiempirically.

• Received 17 April 2008

DOI:https://doi.org/10.1103/PhysRevA.79.062712