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Relativistic four-c...
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Ekström, UlfLinköpings universitet,Beräkningsfysik,Tekniska högskolan
(author)
Relativistic four-component static-exchange approximation for core-excitation processes in molecules
- Article/chapterEnglish2006
Publisher, publication year, extent ...
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American Physical Society,2006
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LIBRIS-ID:oai:DiVA.org:kth-198788
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198788URI
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https://doi.org/10.1103/PhysRevA.73.022501DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12688URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20190119
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A generalization of the static-exchange approximation for core-electron spectroscopies to the relativistic four-component realm is presented. The initial state is a Kramers restricted Hartree-Fock state and the final state is formed as the configuration-interaction single excited state, based on the average of configurations for (n-1) electrons in n near-degenerate core orbitals for the reference ionic state. It is demonstrated that the static-exchange Hamiltonian can be made real by considering a set of time-reversal symmetric electron excitation operators. The static-exchange Hamiltonian is constructed at a cost that parallels a single Fock matrix construction in a quaternion framework that fully exploits time-reversal and spatial symmetries for the D2h point group and subgroups. The K - and L -edge absorption spectra of H2 S are used to illustrate the methodology. The calculations adopt the Dirac-Coulomb Hamiltonian, but the theory is open ended toward improvements in the electron-electron interaction operator. It is demonstrated that relativistic effects are substantial for the L -edge spectrum of sulfur, and substantial deviations from the statistical 2:1 spin-orbit splitting of the intensity distribution are found. The average ratio in the mixed region is 1.54 at the present level of theory.
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Norman, PatrickLinköpings universitet,Beräkningsfysik,Tekniska högskolan(Swepub:liu)patno81
(author)
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Carravetta, V.Istituto per i Processi Chimico-Fisici, Area della Ricerca del C.N.R., Pisa, Italy
(author)
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Linköpings universitetBeräkningsfysik
(creator_code:org_t)
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In:Physical Review A. Atomic, Molecular, and Optical Physics: American Physical Society73:21050-29471094-1622
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