2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/124912A trial function is presented for the $H_2$ molecule which provides the most accurate (the lowest) Bohr-Oppenheimer ground state energy among few-parametric trial functions (with $\leq 14$ parameters). It includes the electronic correlation term in the form $\sim \exp{(γr_{12})}$ where $γ$ is a variational parameter.8 pages, 2 Tables, 18 references (the paper is essentially expanded, several references are added)Atomic PhysicsAtomic and Molecular Clusterstext