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  • 75.30P  (1)
  • SEXAFS  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    The ferromagnetic order and the critical exponentγ of Gd monolayers and thin films on W(110) (1987)
    Springer
    Applied physics 44 (1987), S. 13-18 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 75.70AK ; 75.30P ; 76.30Kg
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The new application of electron-spin resonance to paramagnetic monolayers on well characterized surfaces (LEED, AES) in UHV is described. The high sensitivity of ESR is demonstrated for 10−2 monolayers NO2 adsorbed on Xe/Ag(111), corresponding to ≈1012 detectable molecules. For monolayers of Gd(0001) on W(110) the critical exponentγ of the susceptibility and the ordering temperatureT c are determined by analysing the ESR intensity and resonance field forT→T c + . Both determinations independently give a monolayerT c of app. 271 K. The critical exponentγ changes from 2D to 3D Ising-values for monolayers to thicker films.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00617887
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    New opportunities in soft X-ray absorption to characterise the adsorbate bonding (2000)
    Springer
    Topics in catalysis 10 (2000), S. 199-207 
    Details
    ISSN: 1572-9028
    Schlagwort(e): chemisorption ; molecular dynamics ; SEXAFS ; NEXAFS
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A useful and necessary step to understand the complexity of catalysis is to first study the simple prototype systems which involve elements active in such reactions. Studies throwing light on gas–metal interaction are of vital importance. The X-ray absorption spectroscopy can provide vital information for catalysis as one probes the system on a very local scale. We present state of the art surface EXAFS measurements of carbon, nitrogen and oxygen adsorbed on well characterised metal surfaces (Ni and Cu). The present contribution highlights from experimental measurements supported by improved theoretical calculations that temperature and angular dependent studies are essential for a reliable structural analysis and to gain an insight into absorbate–substrate bonding and kinetics. The low Z metal systems were found suitable to detect unambiguously the photoelectron backscattering by interstitial charge densities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019136722517
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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