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17 THE DENSITY FUNCTIONAL PROGRAM 122<br />

17.4.3 Implementing new hybrid-functionals<br />

Hybrid functionals are defined in the file lib/dalias.registry. Entries can be added to<br />

this file as required, and then run make to update the other registry files.<br />

17.5 Empirical damped dispersion correction<br />

Empirical damped dispersion corrections can be calculated in addition to Kohn-Sham calculations.<br />

This is particularly important in cases where long-range correlation effects become dominant.<br />

The dispersion correction uses the van-der-Waals radii and atomic dispersion coefficients<br />

from Refs. [1-2] and its functional form is given by:<br />

N atoms<br />

E disp = −s 6 ∑<br />

i, j

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