Work

The generalized active space concept for the relativistic treatment of electron correlation. II. Large-scale configuration interaction implementation based on relativistic 2- and 4-spinors and its application

Year: 2003

Type: article

Abstract: The extension of a relativistic double group configuration interaction (CI) formalism to the use of 2- and 4-spinors is presented. We first elucidate the theoretical aspects of the formalism that is needed to work with spinors that are optimized with a Hartree–Fock scheme that includes spin–orbit coupling. We then describe a new general implementation for the computation of sigma vectors and n-particle density matrices that occur in direct CI algorithms. Sample calculations of the spin–orbit splitting in atoms with one particle or hole in an otherwise closed shell configuration l1 (l=1,2,3) and molecules containing such atoms illustrate the advantage of treating this effect in a basis of true spinors rather than in a basis of scalar relativistic orbitals as is conventionally done.

Source: The Journal of Chemical Physics

DOI: 10.1063/1.1590636

Authors: Timo Fleig, Jeppe Olsen, Lucas Visscher

Institutions: Vrije Universiteit Amsterdam, Aarhus University

Language: English

Topic: Advanced Chemical Physics Studies

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: Deutsche Forschungsgemeinschaft, Vrije Universiteit Amsterdam

OpenAlex ID: W2159150433