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  • 1
    Electronic Resource
    Electronic Resource
    Al intermediate oxidation states observed by core level photoemission spectroscopy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4091-4098 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Aluminum oxidation states in stoichiometric or substoichiometric configuration are studied by core level photoemission spectroscopy on different substrates (SiO2, graphite). They are compared with recent results reported for the interface Si–Aln+O. Three Al oxidation states have been identified and their space distribution (binding energy, intensity, and width) is determined in the region from the interface with the substrate up to the surface of a thick overlayer. The Al2+–O intermediate oxidation state is shown to be confined at the interface; on the contrary, the Al1+–O oxidation state and the stoichiometric oxide (alumina) are present beyond the interface region. From the attenuation of the substrate core level peak, the deposition morphology and the attenuation length of the photoelectrons have been deduced. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359866
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence for Pd bonding with Si intermediate oxidation states (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 749-754 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The bonding of Pd atoms evaporated on a thin layer of silicon intermediate oxidation states has been studied by core level and valence band photoemission spectroscopy. The particular substrate was obtained by controlled exposure of a cleaved Si surface to oxygen in order to have few angstroms of silicon oxidation states with a small percentage of SiO2. The deposition of Pd on this substrate was investigated studying the Pd 3d and Si 2p core level spectra as well as the valence band as a function of the metal coverage. Our results indicate evidence that the pristine Si intermediate oxidation states modify their configuration and bind metal atoms. In fact in the Si 2p spectrum changes in the chemical shift are observed for these states, and new peaks arise whose areas increase with metal coverage. The three-dimensional growth characteristics of the metal are deduced from the behavior of the relative intensity for the different components of the Si 2p core spectrum. Furthermore, the shifts of the Pd 3d core level and of the Fermi edge towards higher binding energies at low coverage confirm the formation of metal islands on a nonconducting substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353332
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  • 3
    Electronic Resource
    Electronic Resource
    Angular correlation of scattered annihilation photons, to test the possibility of hidden variables in quantum theory (1974)
    Springer
    Applied physics 5 (1974), S. 63-65 
    Details
    ISSN: 1432-0630
    Keywords: Positron annihilation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Angular correlations of the annihilation photons, Compton scattered by plastic scintillators and detected by means of NaI (T1) crystals, have been measured in order to test the possibility of deviations of the experimental results from the predictions of the quantum theory. In fact, Jauch and Bohm, starting with different motivations, both arrive at the possibility of a lower correlation ratio between the two orthogonal polarization states of the two photons than predicted by quantum theory. This in turn should give a lower azimuthal anisotropy in the angular correlations. Our experimental results compared with the theoretical predictions, after correction for finite geometry by means of a Montecarlo method, do not confirm quantum theory and exclude the hypotheses of Jauch and of Bohm. We are continuing the experiment in order to test wether the breakdown in the polarization correlation depends on the distance (spatial and/or temporal) between the two correlated scattering events, as suggested by Jauch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01193397
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  • 4
    Electronic Resource
    Electronic Resource
    Photoelectron spectroscopy of silver clusters (1992)
    Springer
    The European physical journal 23 (1992), S. 263-267 
    Details
    ISSN: 1434-6079
    Keywords: 33.60.Cv ; 33.70.Jg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comparison of x-ray photoemission from Ag clusters deposited on polygraphite and highly oriented pyrolitic graphite shows the influence of the support both on the valence band and on the core 3d level of the metal. Positive shifts have been obtained with respect to the bulk for the Fermi edge and the 3d peaks depending on the number of silver atoms deposited on the substrates. When the deposition is very small (cluster regime) the positive shifts of the binding energies are quite different for different substrates and cannot have a common origin. In contrast with recent work, we show that several effects contribute to these shifts: initial state effects like charge redistribution as well as final state effects like the hole-electron interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437403
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    Paper (German National Licenses)
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