Relativistic effects on the hyperfine structures of 2 p(4)(P-3)3 p D-2(o), D-4(o), and P-4(o) in F-19 I
2013 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 88, no 4, 042501- p.Article in journal (Refereed) Published
The hyperfine interaction constants of the 2p(4)(P-3)3p D-2(3/2,5/2)o, D-4(1/2-7/2)o, and P-4(1/2-5/2)o levels in neutral fluorine are investigated theoretically. Large-scale calculations are carried out using the multiconfiguration Hartree-Fock (MCHF) and Dirac-Hartree-Fock (MCDHF) methods. In the framework of the MCHF approach, the relativistic effects are taken into account in the Breit-Pauli approximation using nonrelativistic orbitals. In the fully relativistic approach, the orbitals are optimized using the Dirac-Coulomb Hamiltonian with correlation models inspired by the nonrelativistic calculations. Higher-order excitations are captured through multireference configuration interaction calculations including the Breit interaction. In a third (intermediate) approach, the Dirac-Coulomb-Breit Hamiltonian matrix is diagonalized in a relativistic configuration space built with nonrelativistic MCHF radial functions converted into Dirac spinors using the Pauli approximation. The magnetic dipole hyperfine-structure constants calculated with the three relativistic models are consistent and reveal unexpectedly large effects of relativity for 2D(5/2)(o), P-4(3/2)o, and P-4(5/2)o. The agreement with the few available experimental values is satisfactory. The strong J dependence of relativistic corrections on the hyperfine constants is investigated through the detailed analysis of the orbital, spin-dipole, and contact relative contributions calculated with the nonrelativistic magnetic dipole operator.
Place, publisher, year, edition, pages
2013. Vol. 88, no 4, 042501- p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:su:diva-96097DOI: 10.1103/PhysRevA.88.042501ISI: 000325494200003OAI: oai:DiVA.org:su-96097DiVA: diva2:664190
Direction Generale de la Recherche Scientifique et du Developpement Technologique (DGRSDT) of Algeria; Communaute Francaise of Belgium (Action de Recherche Concertee); Belgian National Fund for Scientific Research (FRFC/IISN Convention); IUAP Belgian State Science Policy (BriX network) P7/12 2013-11-142013-11-112013-11-14Bibliographically approved