sanya
sanya@photonics.ru
Total energy of H2 molecule as a function of the internuclear distance R for the ground (1Σ+g), triplet (3Σ+u), singlet (1Σ+u), and doubly excited singlet (1Σ+g) states.
picture from V.I. Minkin, B.Ya. Simkin, and R.M. Minyaev, "Teoriya stroeniya molekul" (Molecular Structure Theory)