Journal
THEORETICAL CHEMISTRY ACCOUNTS
Volume 126, Issue 5-6, Pages 289-304Publisher
SPRINGER
DOI: 10.1007/s00214-010-0733-7
Keywords
Thermochemistry; Atomization energy; Coupled-cluster theory; Explicitly correlated theory; Basis-set extrapolation
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Funding
- Deutsche Forschungsgemeinschaft through the Center for Functional Nanostructures (CFN) [C3.3]
- Fonds der Chemischen Industrie
- DFG [TE 644/1-1]
- University Research Fellowship scheme of the Royal Society
- Ministry of Science, Research and the Arts of Baden-Wurttemberg [7713.14-300]
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Explicitly correlated coupled-cluster theory has developed into a valuable computational tool for the calculation of electronic energies close to the limit of a complete basis set of atomic orbitals. In particular at the level of coupled-cluster theory with single and double excitations (CCSD), the space of double excitations is quickly extended towards a complete basis when Slater-type geminals are added to the wave function expansion. The purpose of the present article is to demonstrate the accuracy and efficiency that can be obtained in computational thermochemistry by a CCSD model that uses such Slater-type geminals. This model is denoted as CCSD(F12), where the acronym F12 highlights the fact that the Slater-type geminals are functions f(r (12)) of the interelectronic distances r (12) in the system. The performance of explicitly correlated CCSD(F12) coupled-cluster theory is demonstrated by computing the atomization energies of 73 molecules (containing H, C, N, O, and F) with an estimated root-mean-square deviation from the values compiled in the Active Thermochemical Tables of sigma = 0.10 kJ/mol per valence electron. To reach this accuracy, not only the frozen-core CCSD basis-set limit but also high-order excitations (connected triple and quadruple excitations), core-valence correlation effects, anharmonic vibrational zero-point energies, and scalar and spin-orbit relativistic effects must be taken into account.
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