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  • 1985-1989  (12)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Use of the .pi..sigma. parameter for characterization of rehybridization upon adsorption on metal surfaces (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 3183-3185 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100261a001
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The bonding of acetonitrile and CH2CN on Ag(110) determined by near edge x-ray absorption fine structure: Evidence for π-donor bonding and azimuthal ordering (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4338-4345 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Carbon K edge near edge x-ray absorption fine structure (NEXAFS) spectra of adsorbed acetonitrile and reactive intermediates derived therefrom on Ag(110) were studied in order to determine their orientation and bonding to the surface. For both the multilayer and the adsorbed monolayer there is excellent agreement between the spectra of the adsorbed acetonitrile and the gas phase species. For the multilayer coverage the orientation of the acetonitrile molecules is not completely random; the molecules prefer an orientation with their bond axes closer to parallel than perpendicular to the surface. At monolayer coverage acetonitrile bound to the surface is unrehybridized. It is bound with its linear molecular skeleton parallel to the surface and randomly oriented azimuthally. Annealing molecular CH3 CN to 325 K in the presence of coadsorbed atomic oxygen produces a linear CH2 CN surface intermediate, the molecular axis of which is parallel to the surface and perpendicular to the close-packed direction. The C–C and C–N bond lengths are essentially unperturbed from their values in gas phase CH3 CN. Bonding appears to occur between the methylene carbon and the metal, as expected. A broadening of the π* resonance for transition into the π* orbital perpendicular to the surface is interpreted in terms of π-donor bonding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456814
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    π bonded intermediates in alcohol oxidation: Orientations of allyloxy and propargyloxy on Ag(110) by near edge x-ray absorption fine structure (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 5316-5322 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The orientation of allyl alcohol (CH2=CHCH2OH), propargyl alcohol (CH 3/4 CCH2OH), and their surface alkoxy groups has been examined on Ag(110) using near edge x-ray absorption fine structure (NEXAFS) measurements. The planes containing the π* orbitals of allyl alcohol and its alkoxy species, allyloxy (CH2=CHCH2O−), are tilted 26±4° and 32±5° from the surface normal, respectively. Allyl alcohol itself shows no azimuthal ordering, but the π* orbital in allyloxy is azimuthally oriented 33±15° from the close-packed direction ([11¯0] azimuth). Propargyl alcohol is randomly oriented on the Ag(110) surface. Its alkoxy group, propargyloxy (CH 3/4 CCH2O−), is strongly oriented with the triple bond axis parallel to the plane of the surface and directed along the [001] azimuth, perpendicular to the troughs. The position of the σ* resonances indicate that no loss of the allylic hydrogen has occurred and that the double and triple bonds are slightly, but not significantly, perturbed from their normal gas phase bond lengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455622
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of the dissociative adsorption of hydrogen on nickel(100) (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 5381-5386 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100271a014
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Oxidation of sulfur dioxide on silver(110): vibrational study of the structure of intermediate complexes formed (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 4051-4057 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100408a044
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Formation of adsorbed sulfate from the oxidation of sulfur dioxide on palladium (100) (1988)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 92 (1988), S. 1974-1981 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100318a053
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Rotational alignment of NO desorbing from Pt(111) (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5038-5039 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452820
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Bonding and adsorption structure of CO on W(100)-(5×1)–C (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 1847-1850 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The adsorption structure of carbon monoxide on W(100)-(5×1)–C has been characterized using high-resolution electron energy loss spectroscopy and near edge x-ray absorption fine structure measurements. A single C–O stretch of 2100 cm−1 is observed at a surface temperature of 130 K. The C–O bond vector is determined to be normal to the surface on the basis of near edge x-ray absorption fine structure measurements. The position in energy of the C(1s)→σ* resonance in CO was measured to be 304.2 eV. The empirical relation between the σ* resonance energy and bond length yields a bond length of 1.12 A(ring). All spectroscopic results are consistent with CO bound atop a single tungsten atom, normal to the surface plane with minimal C–O bond weakening. These results correlate with the known difference in the reactivity of the W(100)-(5×1)–C surface compared to clean W(100). The increased barrier for CO dissociation on the W(100)-(5×1)–C surface is explained on the basis of reduced backdonation of electron density from the tungsten d band to the CO 2π* orbitals. Tight-binding slab calculations for CO on W(100) and W(100)-(5×1)–C which support this contention are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453198
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The dynamics of the dissociative adsorption of alkanes on Ir(110) (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 6506-6514 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dissociative adsorption of C1–C4 alkanes on Ir(110)–(1×2) was investigated using supersonic molecular beam techniques. Three regimes of reactivity were observed. At incident kinetic energies less than 100 kJ/mol the dissociative adsorption probability for propane and butane increased to about 0.6 with both decreasing surface temperature and decreasing translational energy of the incident molecule suggesting that activation occured via trapping of the alkane on the surface. At kinetic energies below 110 kJ/mol for butane, 90 kJ/mol for propane, 60 kJ/mol for ethane, 40 kJ/mol for methane, and at elevated surface temperatures the reaction probabilities for alkanes were independent of surface temperature and translational energy, but increased significantly with the molecular weight or carbon chain length of the incident alkane. This behavior indicates an unactivated reaction channel for each species except methane. At kinetic energies above 110 kJ/mol for butane, 90 kJ/mol for propane, 60 kJ/mol for ethane, and 40 kJ/mol for methane the initial dissociative sticking probability increased with increasing translational energy and was independent of surface temperature, indicating direct translational activation of the incident alkane. The translational energy required to activate the incident alkane via this channel increased with carbon number or molecular weight, indicative of energy transfer processes that dissipate energy in the reactive collision. The dissipative transfer of translational energy out of the reactive channel via a hard cube collision with the surface accounts qualitatively for the increase in the apparent activation barrier with increasing molecular weight in this activated channel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452442
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  • 10
    Electronic Resource
    Electronic Resource
    Activation of n-butane with translational energy on Ir(110)–(1×2) (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 7494-7495 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The initial activation probability s0 for reactive dissociation of n-butane on Ir(110)–(1×2) exhibits at least two reaction channels. For one the direct collisional activation probability is at least 0.21 independent of incident kinetic energy, increasing to near 0.7 with decreasing surface temperature and kinetic energy of the incident beam of butane as a result of trapping of the species in the molecule–surface potential well. At kinetic energies above 120 kJ/mol the reaction probability again increases due to the onset of an activated route. Comparison to the results obtained with ethane suggests that energy transfer to the surface dissipates energy in the collision so that less energy is available to penetrate the longer range repulsive barrier in order to form carbon–metal and hydrogen–metal bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451342
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    Paper (German National Licenses)
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