Anharmonic force fields and thermodynamic functions using density functional theory

Details Anharmonic force fields and thermodynamic functions using density functional theory Anharmonic force fields and thermodynamic functions using density functional theory

2004-11-06

arxiv.org/abs/physics/0411065v1

Molecular Physics 103, 863-876 (2005)

Physics

Chemical Physics

Molecular Physics, in press (N. C. Handy special issue)

Scientific paper

10.1080/00268970512331339369

The very good performance of modern density functional theory for molecular geometries and harmonic vibrational frequencies has been well established. We investigate the performance of density functional theory (DFT) for quartic force fields, vibrational anharmonicity and rotation-vibration coupling constants, and thermodynamic functions beyond the RRHO (rigid rotor-harmonic oscillator) approximation of a number of small polyatomic molecules. Convergence in terms of basis set, integration grid and the numerical step size for determining the quartic force field by using central differences of analytical second derivatives has been investigated, as well as the performance of various exchange-correlation functionals. DFT is found to offer a cost-effective approach with manageable scalability for obtaining anharmonic molecular properties, and particularly as a source for anharmonic zero-point and thermal corrections for use in conjunction with benchmark {\it ab initio} thermochemistry methods.

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