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The leading-order relativistic corrections to the ground-state energy of the positronium molecule (Ps₂) have been computed within the framework of perturbation theory. As the zero-order wave function we used a highly accurate nonrelativistic variational expansion in terms of 6000 explicitly correlated Gaussians that yielded the lowest variational upper bound for this system to date. We also report some expectation values representing the properties of Ps₂.
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Bubin et al. (2007) studied this question.
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