Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Phys Chem Chem Phys. 2006 Oct 21;8(39):4543-9. Epub 2006 Aug 16.

Influence of Coulomb-attenuation on exchange-correlation functional quality.

Author information

  • 1Department of Chemistry, University of Durham, South Road, Durham, UK DH1 3LE.

Abstract

The dependence of functional quality on the attenuation parameters--which control the limiting (r12-->0, infinity) values and the rate of attenuation--is investigated for a Coulomb-attenuated exchange-correlation functional. For the attenuation and functional form considered, satisfaction of an exact long-range condition is detrimental for properties such as atomisation energies and bond lengths, but does improve classical reaction barriers and small molecule electronic excitation energies. The functionals considered can provide high quality valence, Rydberg, intramolecular and asymptotic intermolecular charge transfer (CT) excitations, but none are able to provide a simultaneously optimal description of all classes; CT excitations are not necessarily improved compared to those from conventional functionals. The study highlights the need for further development of Coulomb-attenuated functionals.

PMID:
17047751
[PubMed]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Royal Society of Chemistry
    Loading ...
    Write to the Help Desk