Abstract
Three-body nonadditive interaction energies in the helium trimer are calculated by the complete fourth-order Møller—Plesset perturbation theory with large basis sets including bond functions. It is shown that the three-body energy can be easily converged to the complete basis set limit only if the counterpoise procedure is properly employed. The exchange—repulsion effect dominates the contribution to the three-body energy while the correlation contribution is in accord with the Axilrod—Teller—Muto triple-dipole perturbation expression.
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