Title: On the accuracy of the algebraic approximation in electronic structure calculations for the ground states of H<sub>3</sub><sup>2+</sup> and H<sub>4</sub><sup>3+</sup> using basis sets of atom-centred Gaussian-type functions
Abstract: Sequences of even-tempered basis sets of atom-centered Gaussian-type functions are employed to explore the accuracy that can be achieved for the ground state energies of the H 3 2+ and H 4 3+ species in calculations using finite basis sets. These systems are considered as prototypes for the treatment of polyatomic molecules of arbitrary symmetry within the algebraic approximation. Keywords: algebraic approximation, basis sets, even-tempered, universal.