Distorted s-type orbitals: the ${\rm H}^{+}_{2}$ problem revisited

On the example of the ${\rm H}^{+}_{2}$ molecular ion, we show that spherically distorted s-type orbitals possessing angular dependent orbital exponents, even in a minimal basis may lead to total energies the accuracy of which is comparable with the ones obtained by fully numerical (‘complete basis’) calculations.