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Sökning: WFRF:(Jonauskas Valdas)

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1.
  • Masys, Sarunas, et al. (författare)
  • Geometries of defects in nanodiamonds optimized with the low-cost methods : How good are they for the electronic g-tensor calculations?
  • 2023
  • Ingår i: Diamond and related materials. - : Elsevier BV. - 0925-9635 .- 1879-0062. ; 136
  • Tidskriftsartikel (refereegranskat)abstract
    • The geometry optimization of 30 paramagnetic defects, including biomedically attractive nitrogen-, silicon-, germanium-, and nickel-related color centers, is performed after their incorporation into hydrogenated nano -diamond (ND) of C84H64 size. The main aim is to examine the effectiveness of the low-cost methods, namely, PBEh-3c, r2SCAN-3c, B97-3c, HF-3c, and GFN2-xTB, in reproducing the geometries of these defects basing on the similarity between the results of the subsequent electronic g-tensor calculations. It is revealed that the overall performance of PBEh-3c, r2SCAN-3c, and B97-3c is very alike and can be considered as good, however, none of these "3c" approaches is able to cope with all tested geometries. The results of HF-3c, on the other hand, are disappointing, as this method is outperformed by computationally much more lighter GFN2-xTB. Additional calculations carried out for dangling bonds introduced into hydroxylated and aminated NDs show that all low-cost methods perform reasonably well for this type of defect but the largest quantitative discrepancies once again are demonstrated by HF-3c. The obtained findings lay the foundations for the future studies of larger NDs with the purpose to figure out the magnetic properties dependence on the size of NDs or defect positions within NDs.
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2.
  • Radziute, Laima, et al. (författare)
  • Energy level structure of Er3
  • 2014
  • Ingår i: Journal of Quantitative Spectroscopy and Radiative Transfer. - : Elsevier. - 0022-4073 .- 1879-1352. ; 152, s. 94-106
  • Tidskriftsartikel (refereegranskat)abstract
    • AtomicenergylevelsandE2andM1transitionratesarereportedforthe[Xe]4f11 ground configurationinEr3þ from relativisticmulticonfigurationDirac–Hartree–Fockandcon- figuration interactioncalculations.TheBreittransverseinteractionandleadingQED effectsareincludedasperturbations.Differentstrategiesfordescribingelectroncorrela- tion effectsaretestedandevaluated.Thecalculatedenergylevelsarecomparedwith experimentandresultsfromsemi-empiricalmethods.
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3.
  • Radziute, Laima, et al. (författare)
  • Energy level structure of the ground configuration in the Er3+ free ion
  • 2015
  • Ingår i: Physica Scripta. - : Bibliopolis, Edizioni di Filosofia e Scienze. - 0031-8949 .- 1402-4896. ; 90:5
  • Tidskriftsartikel (refereegranskat)abstract
    • Energy levels of the ground configuration [Xe]4f11 in the Er3+ ion are reported from relativistic configuration interaction calculations. Calculations are performed using the relativistic atomic structure package GRASP2K, which implements the multiconfiguration Dirac–Hartree–Fock method. The Breit transverse interaction and leading QED effects are included as perturbations. The final energies of 41 levels are compared with results from experiment and semi-empirical methods.
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