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  • 1
    Electronic Resource
    Electronic Resource
    Surface diffusion of In on Ge(111) studied by optical second harmonic microscopy (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 6772-6777 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Surface diffusion of In on Ge(111) has been measured by optical second harmonic microscopy. This technique employs surface second harmonic generation to directly image submonolayer surface concentration profiles. The coverage dependence of the diffusivity D can then be obtained from a Boltzmann–Matano analysis. In the coverage range 0.1〈θ〈0.48, the activation energy Ediff decreased with increasing coverage, ranging from 31 kcal/mol at θ=0.1 to 23 kcal/mol at θ=0.48. Over the same coverage range, the pre-exponential factor D0 decreased from 5×102 to 1×10−1 cm2/s. This gradual change reflects a change in diffusion mechanism arising from the disordered nature of the Ge(111) surface. At low coverages, In adatoms sink into the top layer of Ge, and diffusion is dominated by thermal formation of adatom-vacancy pairs. At high coverages, diffusion occurs by normal site-to-site hopping. The gradual change in diffusion parameters with coverage was interrupted by an apparent phase transition at θ=0.16. At this point, both Ediff and D0 peaked sharply at 41 kcal/mol and 6×105 cm2/s, respectively. The desorption energy Edes was measured by temperature programmed desorption. Edes decreased from 60 kcal/mol at submonolayer coverages to 55 kcal/mol at multilayer coverages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467036
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Differential capacitance studies of the specific adsorption of thiosulfate on silver (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 993-998 
    Details
    ISSN: 1572-8838
    Keywords: thiosulfate ; silver ; adsorption ; differential capacitance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The differential capacitance of a polycrystalline Ag electrode was measured in a NaClO4 electrolyte containing Na2S2O3 at concentrations ranging from 0.1 to 20mm and at electrode potentials ranging from −0.9 to −0.3V vs SCE. The differential capacitance measurements were analysed to obtain the surface coverage of specifically adsorbed thiosulfate (S2O32−) as a function of both electrode potential and bulk concentration. The various forms for the adsorption isotherm at an electrochemical interface which are commonly employed are reviewed and discussed. The adsorption behaviour is best explained by the formation of image dipoles by the specifically adsorbed ions, whose energetic interactions are then dominated by repulsion of like dipoles. The adsorption data is quantitatively fit to an adsorption isotherm for interacting dipoles, yielding an effective dipole moment of 0.72D for the system S2O32−/Ag.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003405329562
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    In situ optical studies of metal deposition (1997)
    Springer
    Journal of applied electrochemistry 27 (1997), S. 1219-1231 
    Details
    ISSN: 1572-8838
    Keywords: Morphological control ; Electrodeposition ; Electroless deposition ; Optical probes ; Optical methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The importance of microscopic morphological control to metal electro- and electroless deposition in several emerging technologies is discussed. The use of in situ optical probes of the morphological development of deposits is described. A number of these are reviewed to describe both the potential of each method and the available literature on studies of electro- and electroless deposition. Included are optical probes of the mass transfer boundary layer, X-ray diffractive and spectroscopic methods, ellipsometry, surface-enhanced Raman spectroscopy, infrared absorption spectroscopy, second harmonic generation and electroreflectance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018431903608
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    Paper (German National Licenses)
    Fulltext
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