Journal ArticleDOI
Density-functional exchange-energy approximation with correct asymptotic behavior.
Reads0
Chats0
TLDR
This work reports a gradient-corrected exchange-energy functional, containing only one parameter, that fits the exact Hartree-Fock exchange energies of a wide variety of atomic systems with remarkable accuracy, surpassing the performance of previous functionals containing two parameters or more.Abstract:
Current gradient-corrected density-functional approximations for the exchange energies of atomic and molecular systems fail to reproduce the correct 1/r asymptotic behavior of the exchange-energy density. Here we report a gradient-corrected exchange-energy functional with the proper asymptotic limit. Our functional, containing only one parameter, fits the exact Hartree-Fock exchange energies of a wide variety of atomic systems with remarkable accuracy, surpassing the performance of previous functionals containing two parameters or more.read more
Citations
More filters
Journal ArticleDOI
Revealing noncovalent interactions.
Erin R. Johnson,Shahar Keinan,Paula Mori-Sánchez,Julia Contreras-García,Aron J. Cohen,Weitao Yang +5 more
TL;DR: This work develops an approach to detect noncovalent interactions in real space, based on the electron density and its derivatives, which provides a rich representation of van der Waals interactions, hydrogen bonds, and steric repulsion in small molecules, molecular complexes, and solids.
Journal ArticleDOI
Treatment of electronic excitations within the adiabatic approximation of time dependent density functional theory
TL;DR: In this paper, the three-parameter Lee-Yang-Parr (B3LYP) functional was used to compute low-lying electronic excitations of N2, ethylene, formaldehyde, pyridine and porphin.
Journal ArticleDOI
NWChem: a comprehensive and scalable open-source solution for large scale molecular simulations
Marat Valiev,Eric J. Bylaska,Niranjan Govind,Karol Kowalski,T.P. Straatsma,H. J. J. van Dam,Dunyou Wang,Jarek Nieplocha,Edoardo Aprà,Theresa L. Windus,W. A. de Jong +10 more
TL;DR: An overview of NWChem is provided focusing primarily on the core theoretical modules provided by the code and their parallel performance, as well as Scalable parallel implementations and modular software design enable efficient utilization of current computational architectures.
Journal ArticleDOI
Rationale for mixing exact exchange with density functional approximations
TL;DR: In this paper, it was shown that the optimum integer n is approximately the lowest order of the Gorling-Levy perturbation theory which provides a realistic description of the coupling-constant dependence Exc,λ in the range 0≤λ≤1, whence n≊4 for atomization energies of typical molecules.
Journal ArticleDOI
Accurate description of van der Waals complexes by density functional theory including empirical corrections
TL;DR: The DFT‐D‐BLYP model seems to be even superior to standard MP2 treatments that systematically overbind, and the approach is suggested as a practical tool to describe the properties of many important van der Waals systems in chemistry.