Influence of retardation on the higher-order multipole dispersion contributions to the helium dimer potential

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In this note, we evaluate the influence of the relativistic retardation corrections on the dipole–quadrupole, dipole–octupole and quadrupole–quadrupole contributions to the He–He dispersion potential, which affect the attractive r −8 and r −10 terms. These higher-order corrections influence the binding energy of 4He2 an order of magnitude less than does the retardation correction to the leading r −6 dipole–dipole term.