Show simple item record

dc.contributor.authorKonecny, Lukas
dc.contributor.authorVicha, Jan
dc.contributor.authorKomorovsky, Stanislav
dc.contributor.authorRuud, Kenneth
dc.contributor.authorRepisky, Michal
dc.date.accessioned2022-03-04T13:01:32Z
dc.date.available2022-03-04T13:01:32Z
dc.date.issued2021-12-27
dc.description.abstractThe simulation of X-ray absorption spectra requires both scalar and spin–orbit (SO) relativistic effects to be taken into account, particularly near L- and M-edges where the SO splitting of core p and d orbitals dominates. Four-component Dirac–Coulomb Hamiltonian-based linear damped response time-dependent density functional theory (4c-DR-TDDFT) calculates spectra directly for a selected frequency region while including the relativistic effects variationally, making the method well suited for X-ray applications. In this work, we show that accurate X-ray absorption spectra near L<sub>2,3</sub>- and M<sub>4,5</sub>-edges of closed-shell transition metal and actinide compounds with different central atoms, ligands, and oxidation states can be obtained by means of 4c-DR-TDDFT. While the main absorption lines do not change noticeably with the basis set and geometry, the exchange–correlation functional has a strong influence with hybrid functionals performing the best. The energy shift compared to the experiment is shown to depend linearly on the amount of Hartee–Fock exchange with the optimal value being 60% for spectral regions above 1000 eV, providing relative errors below 0.2% and 2% for edge energies and SO splittings, respectively. Finally, the methodology calibrated in this work is used to reproduce the experimental L<sub>2,3</sub>-edge X-ray absorption spectra of [RuCl<sub>2</sub>(DMSO)<sub>2</sub>(Im)<sub>2</sub>] and [WCl<sub>4</sub>(PMePh<sub>2</sub>)<sub>2</sub>], and resolve the broad bands into separated lines, allowing an interpretation based on ligand field theory and double point groups. These results support 4c-DR-TDDFT as a reliable method for calculating and analyzing X-ray absorption spectra of chemically interesting systems, advance the accuracy of state-of-the art relativistic DFT approaches, and provide a reference for benchmarking more approximate techniques.en_US
dc.identifier.citationKonecny, Vicha, Komorovsky, Ruud, Repisky. Accurate X-ray Absorption Spectra near L- and M-Edges from Relativistic Four-Component Damped Response Time-Dependent Density Functional Theory. Inorganic Chemistry. 2021en_US
dc.identifier.cristinIDFRIDAID 1973082
dc.identifier.doi10.1021/acs.inorgchem.1c02412
dc.identifier.issn0020-1669
dc.identifier.issn1520-510X
dc.identifier.urihttps://hdl.handle.net/10037/24262
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.journalInorganic Chemistry
dc.relation.projectIDNorges forskningsråd: 262695en_US
dc.relation.projectIDNorges forskningsråd: 315822en_US
dc.relation.projectIDNotur/NorStore: nn4654ken_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.titleAccurate X-ray Absorption Spectra near L- and M-Edges from Relativistic Four-Component Damped Response Time-Dependent Density Functional Theoryen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


File(s) in this item

Thumbnail

This item appears in the following collection(s)

Show simple item record