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Approximate relativistic electronic structure methods based on the quaternion modified Dirac equation.
- Source :
-
Journal of Chemical Physics . 9/8/2000, Vol. 113 Issue 10. 4 Diagrams, 1 Chart, 13 Graphs. - Publication Year :
- 2000
-
Abstract
- New implementations of the Lévy-Leblond, zeroth-order regular approach (ZORA) and spin-free Dirac equation are presented within the framework of the four-component relativistic program system DIRAC. This implementation allows systematic incorporation of relativistic effects at different levels of theory and corresponding computational cost. One of the possibilities of the new code is to neglect the effect of spin-orbit coupling in the orbital optimization process and introduce it in a later stage of the calculation. This method is shown to be unstable despite the boundedness of the spin-orbit operator itself. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ELECTRONIC structure
*RELATIVISTIC mechanics
*DIRAC equation
Subjects
Details
- Language :
- English
- ISSN :
- 00219606
- Volume :
- 113
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Journal of Chemical Physics
- Publication Type :
- Academic Journal
- Accession number :
- 4411583
- Full Text :
- https://doi.org/10.1063/1.1288371