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  • 79.60  (5)
  • Analytical Chemistry and Spectroscopy  (3)
  • Chemoembolisation  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Photoemission on highT c superconductors (1987)
    Springer
    Applied physics 44 (1987), S. 75-79 
    Details
    ISSN: 1432-0630
    Keywords: 74.00 ; 74.10 ; 74.70 ; 79.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract XPS and UPS photoemission results on the new high-T c oxide superconductors La2−xMexCuO4 (Me=Sr, Ba) with a maximumT c≈40 K show the following: 1) the electronic density of states atE F is small (smaller than in pure Cu); the work function is metallic like with a value around 4.2 eV. 2) The Cu-2p spectra show hardly a possible small tendency to a mixed valent Cu3+/Cu2+state with increasing Me content, but smaller than expected from the Me2+ concentration suggesting that oxygen defects are responsible for the charge compensation. 3) The core level spectra of La, Me, and O show satellites which are at least partially related to O2− defects and which change in intensity with increasing surface sensitivity of the experiments. First core-level spectra on y1.2Ba0.8CuO4 with aT c ≈ K indicate a complicated composition of these new compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617893
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Die palliative Therapie des HCC (2000)
    Springer
    Der Internist 41 (2000), S. 198-204 
    Details
    ISSN: 1432-1289
    Keywords: Schlüsselwörter HCC ; Chemoembolisation ; Radiofrequenzablation ; Laser
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zum Thema Die transarterielle Chemoembolisation (TACE) wie auch die Thermoablationen sind Methoden, die bei der palliativen Therapie des hepatozellulären Karzinoms (HCC) zum Einsatz kommen. Während die TACE auf einer Zellzerstörung durch die Kombination von Zytostatika und Gefäßokklusion basiert, wird mit der Thermoablation eine hitzeinduzierte Gewebenekrose bei Temperaturen um ca. 60°C erreicht. Der Artikel beschäftigt sich mit den technischen Aspekten und klinischen Indikationen der TACE, der Lasertherapie und der Radiofrequenz(RF)-Ablation. Insbesondere für die letzteren Methoden erscheint eine adäquate Bildgebung zur Steuerung und Überwachung der Therapie indiziert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001080050025
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: 79.60 ; 71.20 ; 71.28
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317405
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  • 4
    Electronic Resource
    Electronic Resource
    Photoemission of LaI2 and CeI2 (1995)
    Springer
    The European physical journal 97 (1995), S. 25-34 
    Details
    ISSN: 1434-6036
    Keywords: 79.60 ; 71.28
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electronic structure of the layered compounds LaI2 and CeI2 was investigated by photoemission and electron energy loss spectroscopy. From the experimental results we are able to confirm the metallic nature of these compounds, and by using photon energy dependent measurements of the valence band we can identify the orbital character of the conduction band as essentially 5d1-like. A detailed analysis of the Ce 3d and 4f spectra yields a remarkably small 4f-5d hybridization strength, almost completely decoupling the f-electron from the conduction band, which makes CeI2 a somewhat unusual system compared to other metallic Ce compounds. Band structure calculations by Jepsen and Andersen [1] confirm these experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317584
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  • 5
    Electronic Resource
    Electronic Resource
    Electron and hole doping in NiO (1995)
    Springer
    The European physical journal 97 (1995), S. 83-93 
    Details
    ISSN: 1434-6036
    Keywords: 79.60 ; 71.20 ; 71.28
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated hole doped (by lithium) and electron-doped (by nickel metal) NiO with photoemission (PES), inverse photoemission (IPES) and low and high energy electron energy loss spectroscopy (EELS). Both types of doping create empty states approximately in the middle of the charge transfer gap of undoped NiO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317591
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  • 6
    Electronic Resource
    Electronic Resource
    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
    Keywords: 79.60 ; 71.20 ; 36.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01544015
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  • 7
    Electronic Resource
    Electronic Resource
    Concerning the angular dependence of the Vicinal 31P—1H coupling constants of phosphonate and of hydroxy-phosphonate derivativesPart IV of a series ‘Studies of Specifically Substituted Organophosphorus Derivatives’. A preliminary account of this work was presented at the 51st Meeting of the Chemical Institute of Canada, Vancouver, B. C., 3rd to 5th June 1968. See also Ref. 1. (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 141-145 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of organic phosphonate and hydroxy-phosphonate derivatives have been synthesised and their NMR spectra fully analysed. The vicinal 31P—1H coupling constants of these derivatives give evidence of a regular angular dependence.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050308
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Charge transfer reactions of organic ions containing oxygen: Correlation between reaction energetics and cross sections (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1987), S. 64-69 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cross sections for charge transfer reactions of organic ions containing oxygen have been obtained using time-of-flight techniques. Charge transfer cross sections have been determined for reactions of 2.0 to 3.4 keV ions produced by electron impact ionization of oxygen containing molecules such as methanol, ethanal and ethanol. Experimental cross section magnitudes have been correlated with reaction energy defects computed from ion recombination energies and target ionization energies. Large cross sections are observed for reacting systems with small energy defects.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210220203
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  • 9
    Electronic Resource
    Electronic Resource
    Charge neutralization of ions from benzene (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1988), S. 256-260 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cross-sections have been measured for the charge neutrilization if ions from benzene in kiloelectron-volt collisions with benezene target molecules. Measured values range from 65 Å2 for the symmetric [C6H6]+—C6H6 resonant reactions to 8 Å2 for [C3H3]+—C6H6 reactions. Cross-sections computed using a simple resonance charge transfer model compare favourably with experimental data for the symmetric reactions. The cross-sections for asymmetric reactions are smaller that those for they symmetric system and magnitudes of the asymmetric cross-sections are correlated with recombination energies of the respective ions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210230407
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