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  • 79.20.Rf  (1)
  • precursor state  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Hydrogen adsorption on clean and oxygen covered Pt(111) (1991)
    Springer
    Catalysis letters 9 (1991), S. 195-204 
    Details
    ISSN: 1572-879X
    Keywords: Hydrogen adsorption-on-platinum ; hydrogen sticking probability ; oxygen covered platinum ; precursor state ; energy dependent dissociation of D2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The dissociative adsorption of hydrogen on oxygen covered Pt(111) has been investigated using molecular beam techniques. The D2-sticking probability has been measured as a function of oxygen coverage (0 〈 ΘO 〈 0.25 ML) and angle of incidence for two incident energies, 14 and 63 meV. In addition, the order of the oxygen layer has been measured using thermal He-scattering. The measurements show clear evidence for the existence of two distinct adsorption processes both on the oxygen covered and on the clean Pt(111) surface, i.e. in the limit were ΘO approaches zero: an activated process which depends on the total oxygen coverage and a non activated process which is sensitive only to the amount of locally ordered oxygen. The non activated process can be explained in terms of a mechanism involving a short living precursor state. The picture for the activated process is less clear. The dependence of this process on the incident energy seems strong evidence for a mechanism involving a barrier to dissociation directly upon impact, whereas the dependence on the oxygen coverage supports previously reported experiments which seem to be only compatible with a precursor mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00773178
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The scattering of thermal He atoms at ordered and disordered surfaces (1985)
    Springer
    Applied physics 38 (1985), S. 153-160 
    Details
    ISSN: 1432-0630
    Keywords: 79.20.Rf ; 68.20+t ; 68.45.Da
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The use of thermal energy atom scattering (TEAS) as a surface investigation tool is reviewed. Specific properties of thermal He scattering, which are particularly advantageous in surface analysis, are discussed; the main causes which hampered so far the broad application of this technique to the investigation of ordered surfaces are analysed. The recent development of TEAS based on the exploitation of the large cross section for He diffuse scattering of adsorbates and vacancies is reviewed. This development extends the capabilities of TEAS to a straightforward investigation of various aspects of disordered surfaces so far hardly accessible to other methods. Examples concerning the lateral distribution of adsorbates and defects, the mutual attraction and repulsion, 2D-phase transitions, mobility and surface diffusion are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616492
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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