Abstract
We report on accurate variational calculations of the Born–Oppenheimer potential for excited states of the hydrogen molecule with , and Φ symmetries. The obtained potential energy curves reach the relative precision of or better along internuclear distances of 0.01–20 au. Calculations rely on the recursive evaluation of two-centre two-electron molecular integrals with exponential functions in arbitrary precision arithmetics. Our results for most of the states are the first-ever reported, and for the previously calculated states constitute an improvement by several orders of magnitude.
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