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- W2014525436 abstract "A string-based coupled-cluster method of general excitation rank and with optimal scaling which accounts for special relativity within the four-component framework is presented. The method opens the way for the treatment of multi-reference problems through an active-space inspired single-reference based state-selective expansion of the model space. The evaluation of the coupled-cluster vector function is implemented by considering contractions of elementary second-quantized operators without setting up the amplitude equations explicitly. The capabilities of the new method are demonstrated in application to the electronic ground state of the bismuth monohydride molecule. In these calculations simulated multi-reference expansions with both doubles and triples excitations into the external space as well as the regular coupled-cluster hierarchy up to full quadruples excitations are compared. The importance of atomic outer core-correlation for obtaining accurate results is shown. Comparison to the non-relativistic framework is performed throughout to illustrate the additional work of the transition to the four-component relativistic framework both in implementation and application. Furthermore, an evaluation of the highest order scaling for general-order expansions is presented." @default.
- W2014525436 created "2016-06-24" @default.
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- W2014525436 date "2011-06-01" @default.
- W2014525436 modified "2023-10-18" @default.
- W2014525436 title "Two- and four-component relativistic generalized-active-space coupled cluster method: Implementation and application to BiH" @default.
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- W2014525436 doi "https://doi.org/10.1063/1.3592148" @default.
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