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  • 07.85.+n  (1)
  • 64.70 Kb  (1)
  • 74.70.Vy  (1)
  • PACS. 78.70.Dm X-ray absorption spectra – 71.28.+d Narrow-band systems; intermediate-valence solids – 79.60.-i Photoemission and photoelectron spectra  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    The electronic structure of the doped one-dimensional transition metal oxide Y 2 - x Ca x BaNiO 5 studied using X-ray absorption (2002)
    Springer
    The European physical journal 26 (2002), S. 449-453 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 78.70.Dm X-ray absorption spectra – 71.28.+d Narrow-band systems; intermediate-valence solids – 79.60.-i Photoemission and photoelectron spectra
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: A strong anisotropic distribution of the holes in Ni 3 d and O 2 p orbitals is observed in the polarization dependent O 1 s and Ni 2 p 3/2 X-ray absorption spectroscopy of the linear-chain nickelate Y2-xCaxBaNiO5 (x = 0, 0.05, 0.1, 0.2), which demonstrates the one-dimensional nature of the electronic state in these compounds. The holes introduced by Ca-doping occupy both O 2 p and Ni 3 d orbitals along the NiO5 chains. By comparing the experimental Ni 2 p 3/2 absorption spectra of Y2-xCaxBaNiO5 to those from charge transfer multiplet calculations we can derive the orbital character of the additional holes to be of ∼60% O2 p and ∼40% Ni 3 d.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e20020113
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  • 2
    Digitale Medien
    Digitale Medien
    High resolution photoabsorption spectroscopy at the carbonK-Edge (1989)
    Springer
    Applied physics 49 (1989), S. 393-397 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 07.85.+n ; 33.20.Rm ; 35.20.Pa
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00615022
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  • 3
    Digitale Medien
    Digitale Medien
    Resonant photoemission at the 2p thresholds of Fe, Co, and Ni metal (1994)
    Springer
    The European physical journal 95 (1994), S. 9-12 
    Details
    ISSN: 1434-6036
    Schlagwort(e): 74.70.Vy ; 78.70.Dm ; 79.60.Eq
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Resonant photoemission studies have been performed at the 2p soft-x-ray absorption thresholds of Fe, Co, and Ni metal. At resonance, the photoelectron intensity exhibits a strong enhancement in the region of the two-hole satellites, which is shown, however, to be mostly due to an incoherent superposition of a photoemission signal with a more intense signal from anL 3 M 4,5 M 4,5 Coster-Kronig decay of the core-ionized state. The resonant enhancement of the valence-band photoemission satellite in Ni metal amounts to a factor of ≃12. In contrast, no photoemission satellites are observed for Fe and Co metal.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01316837
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  • 4
    Digitale Medien
    Digitale Medien
    High-pressure phases of CuI studied by129I-Mössbauer spectroscopy (1992)
    Springer
    Hyperfine interactions 72 (1992), S. 251-257 
    Details
    ISSN: 1572-9540
    Schlagwort(e): 64.70 Kb ; 76.80.+7 ; 62.50.+p
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The results of an129I-Mössbauer study of the high-pressure phases of CuI at 4.2 K and for external pressures up to 71 kbar are reported. The isomer shiftS and the electric quadrupole interactionE q are found to undergo larges discontinuities at the crystallographic phase-transition pressures of ≅18 kbar from zinc-blence to rhombohedral structure and at ≅46 kbar from rhombohedral to tetragonal. The pressure coefficients of these hyperfine parameters are significantly different for the three phases (zinc-blende; rhombohedral; tetragonal) dS/dP=−3.3; =+1.5; =2.5×10−3 mm/s/kbar; dE q/dP=0.0; =−0.92;=+0.31 Mc/s/kbar. These results cannot be explained in terms of a simple molecular-orbital picture; instead, they reflect pressure-induced variations of the halogen-p/metal-d hybridization in the valence bands of the various phases of CuI.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02398869
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