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Accurate Born–Oppenheimer potential energy curve for the hydrogen–antihydrogen system

The energy curve of the hydrogen–antihydrogen system has been calculated using the Rayleigh–Ritz variational method, with a basis of correlated Gaussian functions. The microHartree accuracy of Born–Oppenheimer energies of this system has been achieved for the first time for short internuclear distances. The new upper bound to the terminal distance of Ps binding by the p– p̄ pair has been established to be 0.744 Bohr.