wavefunction | parameters | energy |
---|---|---|
(e^{-Z(r_1+r_2)}) | (Z=2) | (-2.75) |
(e^{-alpha(r_1+r_2)}) | (alpha=1.6875) | (-2.84765) |
(psi(r_1)psi(r_2)) | best (psi(r)) | (-2.86168) |
(e^{-alpha(r_1+r_2)}(1+c r_{12})) | best (alpha, textrm{c}) | (-2.89112) |
Hylleraas (1929) | 10 parameters | (-2.90363) |
Pekeris (1959) | 1078 parameters | (-2.90372) |