On the non-additive second-order Coulomb energy for H-3 in C-2v geometries

For three identical spherical atoms in their ground electronic states, it i s shown that a knowledge of the partial wave components of the additive non -expanded second-order induction energy allows the non-additive non-expande d second-order Coulomb energy to be calculated for certain interatomic geom etries. The results of new partial wave calculations of the nonexpanded sec ond-order Coulomb energy are presented for H-2 and H-3, and are used to dis cuss the rate of convergence of the appropriate partial wave series. Compar ison is made with relevant literature results.