Early oxidation stages of the strained Ge/Si(105) surface: A reflectance anisotropy spectroscopy study (Articolo in rivista)

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  • Early oxidation stages of the strained Ge/Si(105) surface: A reflectance anisotropy spectroscopy study (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/pssb.201350398 (literal)
Alternative label
  • Goletti C.; Fazi L.; Hogan C.; Persichetti L.; Sgarlata A.; Palummo M.; Balzarotti A. (2014)
    Early oxidation stages of the strained Ge/Si(105) surface: A reflectance anisotropy spectroscopy study
    in Physica status solidi. B, Basic research (Internet)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Goletti C.; Fazi L.; Hogan C.; Persichetti L.; Sgarlata A.; Palummo M.; Balzarotti A. (literal)
Pagina inizio
  • 87 (literal)
Pagina fine
  • 94 (literal)
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  • http://onlinelibrary.wiley.com/doi/10.1002/pssb.201350398/abstract (literal)
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  • 252 (literal)
Rivista
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  • 1 (literal)
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  • Scopu (literal)
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  • Dipartimento di Fisica and CNISM Università degli Studi di Roma Tor Vergata Via della Ricerca Scientifica 100133 Roma Italy; Istituto di Struttura della Materia Consiglio Nazionale delle Ricerche (CNR-ISM)Via del Fosso del Cavaliere 10000133 Roma Italy; Department of Physics and European Theoretical Spectroscopy Facility (ETSF)Università degli Studi di Roma Tor Vergata Via della Ricerca Scientifica 100133 Roma Italy; Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland (literal)
Titolo
  • Early oxidation stages of the strained Ge/Si(105) surface: A reflectance anisotropy spectroscopy study (literal)
Abstract
  • We have applied reflectance anisotropy spectroscopy (RAS) to investigate the rebonded-step (RS) reconstructed strained Ge/Si(105) surface. RAS spectra display a marked peak at 2.1eV that is completely cancelled after exposure to about 1200L of molecular oxygen. Ab initio calculations of the RAS signal explain the experimental spectra in terms of optical transitions between filled bulk-like states and empty surface bands. The early stages of exposure of the clean surface to molecular oxygen have been monitored by RAS and scanning tunneling microscopy (STM), correlating the evolution of the optical anisotropy to the bonding configuration of the adsorbed gas. Oxygen atoms are proposed to first adsorb onto the arms and later on the head dimers of the \"horseshoe\" motifs that comprise the RS reconstruction, thus gradually destroying the local order. (literal)
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