A perturbative approach to compute second-order spin-orbit (SO) corrections to a spin-free Dirac-Coulomb Hartree-Fock (SFDC-HF) calculation is suggested. The proposed scheme treats the difference between the DC and SFDC Hamiltonian as perturbation and exploits analytic second-derivative techniques. In addition, a cost-effective scheme for incorporating relativistic effects in high-accuracy calculations is suggested consisting of a SFDC coupled-cluster treatment augmented by perturbative SO corrections obtained at the HF level. Benchmark calculations for the hydrogen halides HX, X = F-At as well as the coinage-metal fluorides CuF, AgF, and AuF demonstrate the accuracy of the proposed perturbative treatment of SO effects on energies and electrical properties in comparison with the more rigorous full DC treatment. Furthermore, we present, as an application of our scheme, results for the electrical properties of AuF and XeAuF.
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7 December 2013
Research Article|
December 05 2013
Spin-free Dirac-Coulomb calculations augmented with a perturbative treatment of spin-orbit effects at the Hartree-Fock level
Lan Cheng;
Lan Cheng
a)
1Institute for Theoretical Chemistry, Department of Chemistry and Biochemistry,
The University of Texas at Austin
, Austin, Texas 78712, USA
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Stella Stopkowicz;
Stella Stopkowicz
b)
2Centre for Theoretical and Computational Chemistry, Department of Chemistry,
University of Oslo
, N-0315 Oslo, Norway
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Jürgen Gauss
Jürgen Gauss
c)
3Institut für Physikalische Chemie,
Universität Mainz
, D-55099 Mainz, Germany
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a)
Electronic mail: chenglanster@gmail.com
b)
Electronic mail: stella.stopkowicz@kjemi.uio.no
c)
Electronic mail: gauss@uni-mainz.de
J. Chem. Phys. 139, 214114 (2013)
Article history
Received:
September 13 2013
Accepted:
November 08 2013
Citation
Lan Cheng, Stella Stopkowicz, Jürgen Gauss; Spin-free Dirac-Coulomb calculations augmented with a perturbative treatment of spin-orbit effects at the Hartree-Fock level. J. Chem. Phys. 7 December 2013; 139 (21): 214114. https://doi.org/10.1063/1.4832739
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