Analytical Wavefunctions of 2D States of Lithium Isoelectronic Sequence

Analytical wavefunctions for the first three 2D states of lithium isoelectronic atomic sequence have been obtained using a split-shell core function plus a generalized orbital form for the outer electron. Values of ionization potentials for the outer electron in the three 2D states have been calculated by the ``frozen-core'' approximation, and these compare very well with experimental results. The use of an extended wavefunction for the lowest 2D state obtained by superposing (2p)2 1S function on the split-shell function for the core leads to energy values within 0.01 a.u. of experimental values.