Accession Number:

ADA522802

Title:

Dipole Moments From Atomic-Number-Dependent Potentials in Analytic Density-Functional Theory

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

2010-01-01

Pagination or Media Count:

33.0

Abstract:

Molecular dipole moments of analytic density-functional theory ADFT are investigated. The effect of element-dependent exchange potential on these moments are examined by comparison with conventional quantum-chemical methods and experiment for the subset of the extended G2 set of molecules that have nonzero dipole moment. Fitting the Kohn-Sham potential itself makes a mean absolute error of less than 0.1 Debye. Variation of alpha Slaters exchange parameter values has far less effect on dipole moments than on energies. It is argued that in variable alpha methods one should choose the smaller of the two rather than the geometric mean of the two alpha values for the heteroatomic part of the linear-combination-atomic-orbitals LCAO density. Calculations on the dipole moment of NH2CH24NO2 are consistent with earlier calculations and show that varying the differences between alpha values for atoms with different atomic numbers has only short-ranged electrostatic effects.

Subject Categories:

  • Physical Chemistry
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE