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  • 1
    Electronic Resource
    Electronic Resource
    Calculations of 1 eV–3 keV oxygen scattering from Ag(111) using ab initio pair potentials (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4318-4329 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Classical trajectory calculations, using an ab initio Ag–O potential, are presented of O2 scattering from Ag(111) in a broad energy range. These calculations can explain the results of various O2/Ag(111) scattering experiments performed at different energies. For O2 scattering around 1 eV, the experimentally observed angular broadening in the scattered signal can be explained as an onset of surface rainbows. The degree of dissociation observed in scattering around 200 eV (incoming angle with respect to surface normal (θi=70°) and around 2 keV θi=85°) can be explained by a collision-induced dissociation. Since O2/Ag(111) is a very corrugated system, we also studied the effect of the parallel velocity on the scattering. With constant normal velocity, the "largest corrugation'' (most energy loss and dissociation) occurs for θi between 30° and 60°. For grazing incidence (θi≈85°), the scattering shows the characteristics of scattering from a flat surface: energy losses only decrease the normal component of the incident velocity and energy losses and fractions of dissociated molecules are independent of the parallel component. However, the molecule gets more rotationally excited than in the case of scattering from a flat surface with the same normal incident velocity. Finally, we investigated the relative amounts of vibrational and rotational excitation leading to dissociation. For a flat surface, the dissociation turns out to be mostly due to vibrational excitation, but for a corrugated surface, also rotational excitation largely contributes to dissociation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457623
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ethylene epoxidation on silver(110): the role of subsurface oxygen (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 6469-6475 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100354a038
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of vapor entrainment on distillation tray efficiency at high pressures (1982)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 28 (1982), S. 535-541 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A recent publication of Fractionation Research Inc. (FRI) (Sakata and Yanagi, 1979) provides experimental evidence that tray efficiency initially rises with increasing pressure, reaches a maximum value, and then decreases again at very high pressures. It is shown in this paper that at these high pressures, significant amounts of vapor can be entrained with the downflowing liquid, e.g., abt. 50 mol per 100 mol liquid at 2,760 kPa. A new model is developed to determine the effect of vapor entrainment on tray efficiency. It is shown that the experimentally observed loss of tray efficiency corresponds with the entrainment rates found at high pressures.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690280403
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    Paper (German National Licenses)
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