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  • 1990-1994  (3)
  • 79.60  (2)
  • Polymer and Materials Science  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    The electronic structure of KMnO4 investigated by photoemission and electron-energy-loss spectroscopy (1994)
    Springer
    The European physical journal 94 (1994), S. 431-438 
    Details
    ISSN: 1434-6036
    Schlagwort(e): 79.60 ; 71.20 ; 71.28
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract From photoemission and electron-energy-loss data the following picture of KMnO4, with MnVII (with a formal charge state Mn7+ (3d 0)) tetrahedrally surrounded by four O2−-ions, is deduced: strong covalent bonding between MnVII and O2− leads to a considerable occupation of the Mn-3 d shell. The ground state of the (MnO4)−1 molecule is an orbital and spin singlet as seen by the absence of any multiplet splitting in the Mn core levels. The valence band shows a four peak structure extending form 4 eV to 8 eV below the Fermi energy. The first peak at 4.2 eV has mainly O-2p character. The remaining peaks are of strongly mixed Mn-3d/O-2p character due to the covalent bonding. This mixing decreases with increasing binding energy. The electron energy loss data show a variety of structures between 2 eV and 10 eV independent of the primary electron energy which defines them as dipole allowed charge-transfer transitions. An additional excitation at 1.8 eV decreases quickly in intensity with increasing electron energy which classifies it as a dipole or spin forbidden transition in the compound. This energy is close to the value of 1.6 eV reported for the activation energy observed in electrical transport data. The results are compared to quantum chemical molecular orbital calculations of the (MnO4)−1 molecule.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01317405
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  • 2
    Digitale Medien
    Digitale Medien
    Photoemission on gold-55-clusters derived from gold-phosphine AuP(C6H5)3Cl (1991)
    Springer
    The European physical journal 20 (1991), S. 377-379 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 79.60 ; 71.20 ; 36.40
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We measured XPS and UPS spectra of gold clusters with 55 atoms, embedded in an electrically isolating phosphine matrix, and of gold-phosphine, from which the clusters were chemically derived. Compared to the spectra of bulk gold the valence band spectrum and the core level spectra of the clusters showed shifts of the peaks and the fermi level to higher binding energies. The shift of the peaks could qualitatively be interpreted by a final state effect. We succeeded in a separation of bulk and surface contributions to the core level spectra and in a reasonable quantitative analysis of the valence band spectrum of the clusters. The Au 4f core level spectrum of gold-phosphine showed two peaks at 1.5 eV higher binding energies than the corresponding peaks of the clusters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01544015
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  • 3
    Digitale Medien
    Digitale Medien
    133. Poröses Silicium - ein Material der Mikrosystemtechnik (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1132-1133 
    Details
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cite.3306509135
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