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  • 73.20.At  (2)
  • 75.50.Bb  (1)
  • 79.20Ds  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Bichromatic two-photon photoemission spectroscopy of image potential states on Ag(100) (1990)
    Springer
    Applied physics 51 (1990), S. 322-326 
    Details
    ISSN: 1432-0630
    Keywords: 73.20At ; 79.60Cn ; 79.20Ds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Bichromatic two-photon photoemission spectroscopy (Bi2PPES) leads to an increased signal-to-noise ratio compared to conventional two-photon photoemission spectroscopy and therefore allows the observation of the first four image potential states as well as a lineshape analysis with improved accuracy on Ag(100). The n=2 image state with a measured linewidth of 37 meV FWHM is the narrowest unoccupied structure measured on any solid surface so far. The intrinsic linewidths of the first two image states were determined as 21±4 meV and 5±5 meV, respectively, in reasonable agreement with theoretical calculations. Disordered adsorption of oxygen on Ag(100) leads to a linewidth broadening of the first and — to a lesser extent — of the second image potential state. A quantitative analysis of the broadening suggests that the underlying mechanism is lifetime shortening due to scattering of the image state electrons by the adsorbate atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324312
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  • 2
    Electronic Resource
    Electronic Resource
    Quantization of electronic states on metal surfaces (1994)
    Springer
    Applied physics 59 (1994), S. 479-486 
    Details
    ISSN: 1432-0630
    Keywords: 73.20.At ; 73.20.Dx ; 79.60.Dp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An electron in front of a metal surface experiences an attractive force due to the induced image charge. Band gaps in the band structure can prevent a penetration into the metal along certain directions. The Coulomb-like potential supports bound states in front of the surface which correspond to a hydrogen atom in one dimension. These image states can be measured with high resolution by two-photon photoemission. The adsorption of metals modifies the states. If the electrons can penetrate into the metal, quantum-well states can develop corresponding to standing waves in the overlayer. Image states on small islands show the quantization effects due to the lateral localization. The spectroscopy of image states by two-photon photoemission permits the investigation of growth and morphology of deposited metal layers, a well as the illustration of fundamental quantum-mechanical effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348266
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic quasiparticle structure of ferromagnetic bcc iron (1995)
    Springer
    The European physical journal 96 (1995), S. 357-372 
    Details
    ISSN: 1434-6036
    Keywords: 71.10.+x ; 71.27.+a ; 75.10.Lp ; 75.50.Bb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the influence of electron correlations on the temperature-dependence of the electronic structure of ferromagnetic bcc iron by use of a manybody evaluation of a generalized model of magnetism. The single-particle part of the model-Hamiltonian is taken from an LDA band structure calculation. The manybody interactions are described by only two parameters, an intraband Coulomb interactionU and an interband exchangeJ. WithU=1.8 eV andJ=0.2 eV the self-consistent model solution yields aT=0 moment of about 2.04 µB and a Curie-temperature of 1044K. Details of the magnetic behaviour of Fe can be traced back to a striking temperature variation of the quasiparticle density of states. A novel explanation for the experimentally-observed non-collapsing exchange splitting is demonstrated in terms of the temperature-dependent spectral density for wave-vectors near the Γ-point. Typical differences in the magnetic behaviour of Fe and Ni are worked out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313058
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  • 4
    Electronic Resource
    Electronic Resource
    Calculation of surface states using a one-dimensional scattering model (1994)
    Springer
    Applied physics 59 (1994), S. 639-643 
    Details
    ISSN: 1432-0630
    Keywords: 73.20.At ; 68.35.Fx
    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 complex electronic band structure of a one-dimensional solid is described using a one-dimensional scattering approach. The method yields the value of the wave function and its derivative between the atomic layers. These values can be matched at the surface to the corresponding values of the wave function on the vacuum side. The method is compared to the two-band approximation of the nearly free electron model. Advantages of the proposed scheme are the easy adaption for layered systems and alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331925
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