title: Relativistic correction to the helium dimer interaction energy.
abstract: The lowest-order relativistic correction to the helium-helium interaction energy has been calculated for the first time, using two independent methods based on expansions in explicitly correlated Gaussian functions. At the equilibrium interatomic distance of 5.6 bohr, this correction amounts to +15.4 +/- 0.6 mK. As a by-product, a new upper bound of -10.9985 K for the nonrelativistic Born-Oppenheimer interaction energy has been obtained.
authors.affiliation: Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Cencek
authors.forename: Jacek
authors.initials: J
authors.lastname: Komasa
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Pachucki
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Szalewicz