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We introduce an approximation to the short-range correlation energyfunctional with multide-terminantal reference involved in a variant ofrange-separated density-functional theory. This approximation is a localfunctional of the density, the density gradient, and the on-top pair density,which locally interpolates between the standard Perdew-Burke-Ernzerhofcorrelation functional at vanishing range-separation parameter and the knownexact asymptotic expansion at large range-separation parameter. When combinedwith (selected) configuration-interaction calculations for the long-range wavefunction, this approximation gives accurate dissociation energy curves of theH2, Li2, and Be2 molecules, and thus appears as a promising way to accuratelyaccount for static correlation in range-separated density-functional theory.

Range-separated multideterminant density-functional theory with a short-range correlation functional of the on-top pair density