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The effect of an implicit medium on dispersive interactions of particle pairsis discussed and simple expressions for the correction relative to vacuum arederived. We show that a single point Gauss quadrature leads to the intuitiveresult that the vacuum van der Waals $C_6$ coefficient is screened by thepermittivity squared of the environment evaluated near to the resonancefrequencies of the interacting particles. This approximation should beparticularly relevant if the medium is transparent at these frequencies. In themanuscript, we provide simple models and sets of parameters for commonly usedsolvents, atoms and small molecules.

Effective screening of medium-assisted Van der Waals interactions between embedded particles