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How Accurate Are Static Polarizability Predictions from Density Functional Theory? An Assessment over 132 Species at Equilibrium Geometry

preprint
revised on 13.07.2018 and posted on 13.07.2018 by Diptarka Hait, Martin Head-Gordon
Static polarizabilities are the first response of the electron density to electric fields, and are therefore important for predicting intermolecular and molecule-field interactions. They also offer a global measure of the accuracy of the treatment of excited states by density functionals in a formally exact manner. We have developed a database of benchmark static polarizabilities for 132 small species at equilibrium geometry, using coupled cluster theory through triple excitations (extrapolated to the complete basis set limit), for the purpose of developing and assessing density functionals. The performance of 60 popular and recent functionals are also assessed, which indicates that double hybrid functionals perform the best, having RMS errors in the range of 2.5-3.8% . Many hybrid functionals also give quite reasonable estimates with 4-5% RMSE. A few meta-GGAs like mBEEF and MVS yield performance comparable to hybrids, indicating potential for improved excited state predictions relative to typical local functionals. Some recent functionals however are found to be prone to catastrophic failure (possibly as a consequence of overparameterization), indicating a need for caution in applying these.

Funding

D.H. was funded by a Berkeley Fellowship. This research was supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.

History

Email Address of Submitting Author

diptarka@berkeley.edu

Email Address(es) for Other Author(s)

mhg@cchem.berkeley.edu

Institution

University of California, Berkeley

Country

USA

ORCID For Submitting Author

0000-0003-1570-920X

Declaration of Conflict of Interest

There are no conflicts of interest.

Version Notes

Added four more functionals and some further disccusion.

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