title: Third-order dispersion energy from response functions.
abstract: In the second order of perturbation theory, the dispersion component of the interaction energy of two atoms or molecules can be expressed as an integral of frequency-dependent response functions of monomers. An analogous formula is derived here for the third-order dispersion energies. The general formula involves a nonstandard response function, but for atoms in asymptotic expansion the expression involves only the standard dynamic hyperpolarizabilities.
authors.affiliation: Institute of Physics, Technical University of Lodz, ul. Wolczanska 219, 93-005 Lodz, Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Pernal
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Szalewicz