Photoionization of Li+

The method of polarized orbitals is used to obtain a wave function for an electron in the field of a Li 2+ ion. For low electron energies the polarizedorbital phase shifts are in reasonable agreement with extrapolated experimental quantum defects. The photoionization cross section for Li + is calculated in the dipole length and velocity formulations using the polarized-orbital wave function for the continuum state and six-parameter and twenty-parameter Hylleraas-type wave functions for the ground state. Oscillator strength sums suggest that the calculated cross sections are accurate to about 3 5%. A comparison of the present calculations with experimental data on metallic lithium show that absorption coefficients of Li + and metallic lithium are not equal.