Abstract
The energy of some doubly-excited states 1,3 Sigma u(2psigma (u),2ssigma (g)), 1,3 Sigma u(2psigma (u),3ssigma (g)), 1,3 Sigma u(2psigma (u),3dsigma (g)) and 1,3 Sigma g(2psigma (u),3psigma (u)) of H2 are calculated for various internuclear distances by first-order perturbation theory using as zero-order wavefunction a correlated prolate-spheroidal function containing no adjustable parameters.