[en] The two-parameter function, phi = (C1 + C2r/sup n-1/) exp (-zeta r), (n = 2-5), was used as a basis function to determine the independent particle model energy of two-electron atomic systems in their ground state. The best energy is found for n = 3 (He-B3+) and for n = 4 (H-). The energy values are significantly close to Hartree-Fock results. 12 references