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  • 1
    Electronic Resource
    Electronic Resource
    Chemisorbed CO site interconversion on Ni(111) induced by the electric field of physisorbed second layers (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 1628-1635 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new and general phenomenon related to the electrical polarization of a condensed layer has been observed: A polar overlayer physisorbed on top of a chemisorbed CO layer on Ni(111) causes a CO site interconversion from terminally bound CO to bridged bound CO species in the CO underlayer. It has been found that the site interconversion observed is independent of the molecular identity of the physisorbed overlayer, but is closely related to the work-function decrease induced by the polarized overlayer. This phenomenon is explained in terms of the interaction of CO with a very strong electric field, which is of the order of 0.3 V/A(ring), produced by the polarized overlayers. The electric field causes a rehybridization of underlayer chemisorbed CO species producing a redistribution of CO molecules to different adsorption sites on Ni(111).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462147
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  • 2
    Electronic Resource
    Electronic Resource
    Field-induced surface chemistry of NO (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 6065-6069 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A microscopic theory of field adsorption is used to study the adsorption and reaction of NO on a Pt(111) surface in high electrostatic fields. We find that below 0.4 V/A(ring) only NO is adsorbed stably. Above this value dissociation sets in that leads around 1.2 V/A(ring) to the formation of N2O. A molecular orbital analysis is given of the reaction pathway and to identify the stabilization mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459494
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  • 3
    Electronic Resource
    Electronic Resource
    Theory of sticking: The effect of lateral interactions (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 9593-9612 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A generalization of the kinetic lattice gas model is used to study the coverage and temperature dependence of the sticking coefficient due to intrinsic and extrinsic precursors and in the presence of lateral interactions. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471701
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal desorption kinetics (1992)
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 774-781 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00039a009
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  • 5
    Electronic Resource
    Electronic Resource
    Theory of dissociative and nondissociative adsorption and desorption (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 6982-6999 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Based on nonequilibrium thermodynamics we formulate a general theory of the kinetics of adsorption, desorption, and dissociation of gases at surfaces. We begin with a concise formulation of dissociation equilibrium at surfaces and then derive the kinetic equations for adsorption, desorption, and dissociation. For the explicit calculations we employ a lattice gas model for homonuclear molecules with both atoms and molecules present on the surface. Lateral interactions between all species are accounted for. In a series of model calculations we discuss equilibrium properties, such as heats of adsorption, and examine the role of dissociation dis-equilibrium on the time evolution of an adsorbate during temperature programmed desorption. The further effect of (attractive or repulsive) lateral interactions on the kinetics is elucidated in further model calculations. As a realistic example we apply the theory to oxygen on Pt(111). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478604
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  • 6
    Electronic Resource
    Electronic Resource
    Lateral interactions in coadsorbate layers: Vibrational frequency shifts (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 2115-2122 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effect of coadsorbed argon, hydrogen, and oxygen on the internal vibration of CO on Ru(001) has been studied by infrared absorption spectroscopy in order to disentangle electrostatic and chemical frequency shifts. Ar is expected to lead only to the former, H only to the latter, and O to a combination. In all cases, intermolecular interactions among CO molecules are avoided by working at very low CO coverages (0.01–0.03 ML). Interestingly, the observed frequency shifts are discrete rather than continuous which is attributed to a local interaction. Density functional calculations for suitable clusters have been used to model the frequency shifts, arriving at good agreement with experiment. Analysis of these theoretical results is then used to quantify the contributions of electrostatic fields and of chemical effects on these shifts. It is shown that, despite very different signatures of the various coadsorbate species, the observed C–O frequency shifts are largely of electrostatic origin, provided one uses the electrostatic field generated by the coadsorbate and not an effective constant field. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479481
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  • 7
    Electronic Resource
    Electronic Resource
    Oscillating hydrogen-water reactions on a platinum field emitter
    Amsterdam : Elsevier
    Surface Science 318 (1994), S. L1211-L1218 
    Details
    ISSN: 0039-6028
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0039-6028(94)90094-9
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  • 8
    Electronic Resource
    Electronic Resource
    Dielektrische Wellenleiter als Plasmasonden (1967)
    Springer
    The European physical journal 200 (1967), S. 541-555 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A microwave interferometer is described, by which the electron density in a small volume inside of a plasma can be measured. By dielectric rods acting as waveguides the microwave is led to this volume. For a given electron density the phase shift is calculated for this volume and for the dielectric rods. By a suitable choice of the radius and the dielectric constant of the rods the phase shift along the rods can be surpressed. The influence of plasma sheaths is discussed. In a special application to the plasma of the negative glow these interferometric measurements are compared with Langmuir probe measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01326244
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  • 9
    Electronic Resource
    Electronic Resource
    Theory of surface processes (1990)
    Springer
    Applied physics 51 (1990), S. 491-497 
    Details
    ISSN: 1432-0630
    Keywords: 68.10Md ; 82.65My ; 82.65Dp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract To understand kinetic processes at surfaces, a macroscopic theory is advanced based on the Onsager approach to nonequilibrium thermodynamics. A microscopic basis is then sought by re-examining the kinetic lattice gas model to generalize the underlying dynamics for adsorption, desorption and diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324732
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetic lattice gas model: Langmuir, Ising and interaction kinetics (1990)
    Springer
    Applied physics 51 (1990), S. 183-190 
    Details
    ISSN: 1432-0630
    Keywords: 82.63 Dp ; 68.10 Jy
    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 kinetic lattice gas model is formulated properly to account for adsorption, desorption, and diffusion at surfaces. We examine three choices for the transition probabilities in the master equation, which we term Langmuir, Ising and interaction kinetics, and show how they lead to different sticking coefficients and desorption rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323999
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