Charging induced emission of neutral atoms from NaCl nanocube corners (Articolo in rivista)

Type
Label
  • Charging induced emission of neutral atoms from NaCl nanocube corners (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Ceresoli, D; Zykova-Timan, T; Tosatti, E (2008)
    Charging induced emission of neutral atoms from NaCl nanocube corners
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ceresoli, D; Zykova-Timan, T; Tosatti, E (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 20 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Ceresoli, Davide; Zykova-Timan, Tatyana; Tosatti, Erio] SISSA, I-34014 Trieste, Italy; [Ceresoli, Davide; Zykova-Timan, Tatyana; Tosatti, Erio] DEMOCRITOS, I-34014 Trieste, Italy; [Tosatti, Erio] Int Ctr Theoret Phys, I-34014 Trieste, Italy (literal)
Titolo
  • Charging induced emission of neutral atoms from NaCl nanocube corners (literal)
Abstract
  • Detachment of neutral cations/anions from solid alkali halides can in principle be provoked by donating/subtracting electrons to the surface of alkali halide crystals, but generally constitutes a very endothermic process. However, the amount of energy required for emission is smaller for atoms located in less favorable positions, such as surface steps and kinks. For a corner ion in an alkali halide cube the binding is the weakest, so it should be easier to remove that atom, once it is neutralized. We carried out first principles density functional calculations and simulations of neutral and charged NaCl nanocubes, to establish the energetics of extraction of neutralized corner ions. Following hole donation ( electron removal) we find that detachment of neutral Cl corner atoms will require a limited energy of about 0.8 eV. Conversely, following the donation of an excess electron to the cube, a neutral Na atom is extractable from the corner at the lower cost of about 0.6 eV. Since the cube electron affinity level ( close to that a NaCl( 100) surface state, which we also determine) is estimated to lie about 1.8 eV below vacuum, the overall energy balance upon donation to the nanocube of a zero- energy electron from vacuum will be exothermic. The atomic and electronic structure of the NaCl( 100) surface, and of the nanocube Na and Cl corner vacancies are obtained and analyzed as a byproduct. (literal)
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