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  • 1990-1994  (1)
  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    High resolution x-ray absorption spectroscopy of linear hydrocarbons adsorbed on noble metal surfaces (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 1560-1573 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Recent progress in the performance of soft x-ray monochromators has revealed new features in soft x-ray molecular photoabsorption spectra. We present here a comprehensive high resolution x-ray absorption study on the linear hydrocarbons C2H2n and C2D2n, adsorbed on Ag(100) and Cu(100) at 50 K and in the solid and the gas phase. A line shape analysis is given, for the bound as well as for the continuum resonances and the absorption thresholds, by means of models easily accessible to the experimentalist, leading to a quantitative understanding of the observed spectra, including the vibrational envelopes. Changes in intramolecular bond lengths upon core-hole excitation can be determined and tracked as a function of deuteration and chemisorption. The effects of the substrate bonding on the vibrational envelopes are analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462140
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High resolution photoabsorption spectroscopy at the carbonK-Edge (1989)
    Springer
    Applied physics 49 (1989), S. 393-397 
    Details
    ISSN: 1432-0630
    Keywords: 07.85.+n ; 33.20.Rm ; 35.20.Pa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Using plane grating, ellipsoidal mirror, grazing incidence monochromators at the storage ring BESSY, a resolution of ≦ 150meV was achieved for a photon energy of 285 eV. This high energy resolution considerably extends the range of possible studies using core level Spectroscopy. Some of the new opportunities are illustrated at the CK edge by resolving the vibrational fine structure of condensed C2H4 multilayers in the (1s−1, π*) state by means of photoabsorption spectroscopy. For the sake of comparison with other high resolution instruments, the vibrational fine structure of condensed N2 multilayers at the NK edge (∼ 400eV) was also measured, yielding a resolving power of 3000.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615022
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Intramolecular resonances afterK-shell excitation of C2H2n adsorbed on Ag and Cu(100) surfaces (1989)
    Springer
    The European physical journal 11 (1989), S. 219-229 
    Details
    ISSN: 1434-6079
    Keywords: 33.20.Rm ; 33.70.Tg ; 35.20.Dp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The near edge X-ray absorption fine structure (NEXAFS) at the C K-edge of C2H2, C2H4, C2H6 on Cu(100) and Ag(100) surfaces is studied. The oriented character of the molecules on the surface combined to the dipole selection rules for photon absorption allows an experimental assignment of the nature of the various final states. A careful fitting of the NEXAFS spectra reveals final states of C–H character and shake-up satellites of the C(1 s) to π* (C–C) transition. The asymmetric line shape of the C(1 s) to σ* (C–C) transition is described in a scattering model of the photoelectron from the molecular potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438008
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    Paper (German National Licenses)
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