AI Article Synopsis
- The earlier multi-reference coupled-cluster theory faced energy discontinuities when changing the reference state during potential energy curve calculations.
- A new solution is proposed using natural active space self-consistent field orbitals to resolve these discontinuities.
- This method results in smooth potential energy curves for various dissociation scenarios, specifically demonstrated with hydrogen fluoride and the water molecule.
Article Abstract
The earlier proposed multi-reference state-specific coupled-cluster theory with the complete active space reference [CASCC; Lyakh et al., J. Chem. Phys. 122, 024108 (2005)] suffered from a problem of energy discontinuities when the formal reference state was changing in the calculation of the potential energy curve (PEC). A simple remedy to the discontinuity problem is found and is presented in this work. It involves using natural complete active space self-consistent field active orbitals in the complete active space coupled-cluster calculations. The approach gives smooth PECs for different types of dissociation problems, as illustrated in the calculations of the dissociation of the single bond in the hydrogen fluorine molecule and of the symmetric double-bond dissociation in the water molecule.
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| http://dx.doi.org/10.1063/1.4926392 | DOI Listing |
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