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We propose a new scheme to parameterize effective potentials that can be usedto simulate atomic systems such as oxide glasses. As input data for theoptimization, we use the radial distribution functions of the liquid and thevibrational density of state of the glass, both obtained from ab-initiosimulations, as well as experimental data on the pressure dependence of thedensity of the glass. For the case of silica, we find that this new schemefacilitates finding pair potentials that are significantly more accurate thanprevious ones even if the functional form is the same, thus demonstrating thateven simple two-body potentials can be superior to more complex three-bodypotentials. We have tested the new potential by calculating the pressuredependence of the elastic moduli and find a good agreement with thecorresponding experimental data.

New optimization scheme to obtain interaction potentials for oxide glasses