Ab initio thermochemistry beyond chemical accuracy for first-and second-row compounds
Abstract
By judicious use of extrapolations to the 1-particle basis set limit and -particle calibration techniques, total atomization energies of molecules with up to four heavy atoms can be obtained with calibration accuracy (1 kJ/mol or better, on average) without any empirical correction. For the SCF energy a 3-point geometric extrapolation is the method of choice. For the MP2 correlation energy, a 2-point extrapolation is recommended, while for CCSD and CCSD(T) correlation energies we prefer the 3-point formula. Addition of high-exponent `inner polarization functions' to second-row atoms is essential for reliable results. For the highest accuracy, accounts are required of inner-shell correlation, atomic spin-orbit splitting, anharmonicity in the zero-point energy, and scalar relativistic effects.
Cite
@article{arxiv.physics/9808013,
title = {Ab initio thermochemistry beyond chemical accuracy for first-and second-row compounds},
author = {Jan M. L. Martin},
journal= {arXiv preprint arXiv:physics/9808013},
year = {2007}
}
Comments
43 pages, in upcoming NATO ASI volume "Energetics of stable molecules and reactive intermediates" (ed. M. E. Minas da Piedade)