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  • Springer  (2)
  • American Institute of Physics (AIP)  (1)
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  • 1
    Publication Date: 1988-09-01
    Print ISSN: 0947-8396
    Electronic ISSN: 1432-0630
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 7682-7688 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Formation and desorption of aluminum hydride from hydrogen covered Al(110), Al(100), and Al(111) has been investigated, using thermal desorption spectroscopy. Both desorption of aluminum hydride and molecular hydrogen has been detected with branching ratios depending on surface structure. Production of aluminum hydride is negligible on the rough (110) surface, whereas on the flat (111) plane up to 50% of the adsorbed hydrogen is desorbed in form of aluminum hydride. Furthermore, aluminum hydride formation is strongly enhanced with an increase of the heating rate. Desorption of molecular hydrogen follows a close to zero order reaction, with a desorption energy around 17±1 kcal/mol. Aluminum hydride desorption can be described best by a fractional order (≈0.5), with a desorption energy of 27±1 kcal/mol. Angular distribution measurements reveal desorption distribution functions of D(aitch-theta)≈cos aitch-theta−cos3 aitch-theta for aluminum hydride and D(aitch-theta)≈cos2 aitch-theta−cos15 aitch-theta for molecular hydrogen, strongly dependent on surface structure.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 47 (1988), S. 55-62 
    ISSN: 1432-0630
    Keywords: 68.10 Jy ; 68.45 Da ; 82.65 My
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract On a “real surface” adsorption and desorption are frequently completely controlled by surface defects. In a model case the influence of steps, point defects and foreign atoms on the adsorption of H2/Ni is investigated. An analysis of the temperature dependence and the angular variation of the sticking coefficient allows the description of the physics of adsorption near defects. In some instances rather small defect concentrations lead to pronounced changes in the adsorption, including isotope effects.
    Type of Medium: Electronic Resource
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