Abstract
We present a parameter-free method for an accurate determination of long-range van der Waals interactions from mean-field electronic structure calculations. Our method relies on the summation of interatomic coefficients, derived from the electron density of a molecule or solid and accurate reference data for the free atoms. The mean absolute error in the coefficients is 5.5% when compared to accurate experimental values for 1225 intermolecular pairs, irrespective of the employed exchange-correlation functional. We show that the effective atomic coefficients depend strongly on the bonding environment of an atom in a molecule. Finally, we analyze the van der Waals radii and the damping function in the correction method for density-functional theory calculations.
- Received 3 November 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.073005
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