Concepedia

The restricted active space (RAS) state interaction approach with spin–orbit coupling

Per‐Åke Malmqvist, Björn O. Roos, Bernd Schimmelpfennig

Chemical Physics Letters · 2002 · 1.2K citations · 23 references

DOI

Concepts

References

23

Second-order perturbation theory with a CASSCF reference function

Kerstin Andersson, Per Aake. Malmqvist, Bjoern O. Roos et al. · The Journal of Physical Chemistry · 1990 · 3.3K citations

, , +9

Quantum electrodynamical corrections to the fine structure of helium

Marvin Douglas, N. Kroll · Annals of Physics · 1974 · 2.9K citations

, , +10

Relativistic electronic-structure calculations employing a two-component no-pair formalism with external-field projection operators

Bernd A. Heß · Physical review. A, General physics · 1986 · 2.5K citations

, , +17

A mean-field spin-orbit method applicable to correlated wavefunctions

Bernd A. Heß, Christel M. Marian, Ulf Wahlgren et al. · Chemical Physics Letters · 1996 · 1.3K citations

, , +9

Relativity and the periodic system of elements

Pekka Pyykkö, Jean Paul Desclaux · Accounts of Chemical Research · 1979 · 1.1K citations

, , +5