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Park, Noejung
Computational Physics & Electronic Structure Lab
Research Interests
  • Electronic structure calculation, computational physics, computational material science

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Ab initio study of Kubas-type dihydrogen fixation onto d-orbital states of Ca adatoms

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Title
Ab initio study of Kubas-type dihydrogen fixation onto d-orbital states of Ca adatoms
Author
Cha, JanghwanChoi, Cheol HoPark, Noejung
Keywords
Ab initio study; Binding state; Binding strength; Density functionals; Dihydrogen; Exchange functional; Orbital state; Orbitals; Valencies
Issue Date
201109
Publisher
ELSEVIER SCIENCE BV
Citation
CHEMICAL PHYSICS LETTERS, v.513, no.4-6, pp.256 - 260
Abstract
We investigate the Kubas-type attraction of dihydrogen onto Ca adatoms and validity of approximated density functionals for such problems. Dihydrogens can be bound to Ca adatom sites only when the Ca adsorption configurations stabilize the 3d orbitals. When the valency of the Ca site is dominated by the 4s orbital, the binding strength of dihydrogens is negligible. For such cases, exchange functional adopted in the popular density-functionals can possibly lead to an over-stabilization of the dihydrogen binding states. We show that marginally activated graphene surfaces can induce such stabilization of the 3d-orbital states of the adsorbed Ca.
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DOI
http://dx.doi.org/10.1016/j.cplett.2011.08.008
ISSN
0009-2614
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