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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 30 (2000), S. 193-200 
    ISSN: 1572-8838
    Keywords: copper ; copper oxide ; gadolinium-doped cerium oxide ; nitrogen oxide ; oxygen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electrochemical reduction of NO and O2 on a Cu-point electrode covered with a surface layer of CuO is investigated in an electrochemical cell with a gadolinium doped cerium oxide oxygen ion conducting electrolyte in the temperature interval 300–500 ∘C. It is shown that the reduction of NO on CuO is possible at a lower overvoltage than it is in the case of the reduction of O2. The results indicate that the reduction of NO on CuO is not inhibited in the presence of O2 and that the reduction of NO can be selectively performed on a CuO-electrode.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Ionics 6 (2000), S. 340-345 
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Cyclic voltammetry has been used to investigate the electrocatalytic properties of oxide based electrodes for the reduction of NO and oxygen. Perovskites of compositions LaxSr1-xMnO3+δ, (LSMx), with 0.05 ≤ x ≤ 0.5 and La0.6Sr0.4Fe0.8Mn0.2O3-δ, (LSFM), the spinels Co3O4 and CuCr2O4 and the mixed oxide V2O5 have been selected and investigated in the temperature range 300 – 500 °C. The materials show good catalytic properties against both NO oxidation and NO reduction. The catalytic activity as well as the selectivity is dependent both on the redox behavior of the compound and on the oxygen defect concentration.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 17 (2001), S. 189-204 
    ISSN: 1434-6079
    Keywords: PACS. 36.40.-c Atomic and molecular clusters – 36.40.Cg Electronic and magnetic properties of clusters – 36.40.Qv Stability and fragmentation of clusters – 36.40.Wa Charged clusters – 39.10.+j Atomic and molecular beam sources and techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Thermionic emission from hot fullerene anions, CN -, has been measured in an electrostatic storage ring for even N values from 36 to 96. The decay is quenched by radiative cooling and hence the observations give information on the intensity of thermal radiation from fullerenes. The experiments are analysed by comparison with a simulation which includes the quantisation of photon energy and the statistics of emission. Experiments with heating of the molecules with a laser beam confirm the interpretation of the observations in terms of radiative cooling and give an independent estimate of the cooling rate for C60 -. The measured cooling rates agree in general within a factor of two with the prediction from a classical dielectric model of a thermal radiation intensity of ∼ 300 eV/s for C60 at 1 400 K, scaling approximately with the 6th power of the temperature and with the number of atoms in the molecule.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 127 (2000), S. 529-532 
    ISSN: 1572-9540
    Keywords: clusters ; dianions ; photodetachment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Titanium clusters are produced by laser vaporization of a metal wire in a helium gas pulse, stored in a Penning trap, size selected and transformed into multiply charged anions by electron attachment. Both doubly and triply charged titanium clusters are observed. For the first observation of photodetachment of electrons from metal cluster dianions, Ti 55 2- clusters are selected and excited by a laser pulse, which leads to the emission of an excess electron: Ti 55 2- → e− + Ti 55 - .
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 21 (2002), S. 163-166 
    ISSN: 1434-6079
    Keywords: PACS. 36.40.Qv Stability and fragmentation of clusters – 36.40.Wa Charged clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The dimer dissociation energies of gold cluster ions Au + n , n = 9, 11, 13, 15 have been determined with an extension of a recently developed model-independent method. Monomer-dimer decay pathway branching ratios provide the energy dependent process which is needed in this method. The measured values are D 2 ( Au + 9 ) = 3.66(8)(9) eV, D 2 ( Au + 11 ) = 4.27(11)(8) eV, D 2 ( Au + 13 ) = 4.50(9)(7) eV and D 2 ( Au + 15 ) = 4.29(10)(6) eV.
    Type of Medium: Electronic Resource
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  • 16
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird gezeigt, daß in wäßrigen Lösungen von TiCl3 in allen Konzentrationsbereichen wesentliche Anteile von Hydrolyseprodukten vorhanden sind, so daß derartige Lösungen zum Studium der Lichtabsorption definierter Komplexionen des Ti(III) ungeeignet sind. Für die erste Hydrolysenstufe des Ions [Ti(H2O)6]3+ wird eine Hydrolysenkonstante zwischen 1,3 und 0,5 · 10-4 wahrscheinlich gemacht.Das Absorptionsspektrum wäßriger Lösungen von TiCl3 ist in seinem langwelligen Bereich gegen Symmetrieänderungen in erster Sphäre der in den Lösungen vorliegenden Komplexionen (hervorgerufen z. B. durch Hydrolyse) vergleichsweise unempfindlich.Die Darstellung des Hexaharnstoff-Titan(III)-jodids, [Ti(ha)6]J3, wird beschrieben. Die Ergebnisse magnetischer und röntgenographischer Untersuchungen werden mitgeteilt.Das Absorptionsspektrum des [Ti(ha)6]3+-Komplexions in Lösung sowie das Spektrum des kristallisierten Komplexsalzes zeigt eine Bande mit deutlicher Doppelstruktur bei etwa 600 mμ.Die Änderungen des Hexaharnstoff-Titan(III)-Spektrums in wäßriger Lösung infolge Aquotisierung sind denjenigen im Spektrum des entsprechenden Chrom(III)-hexaharnstoff-Komplexes weitgehend ähnlich.Es gelingt, die Absorptionseigenschaften von Titan(III))-Komplexen der Koordinationszahl 6 mit sechs gleichen Dipolliganden (H2O, ROH, CO(NH2)2) mit Hilfe von Symmetriebetrachtungen auf der Grundlage der elektrostatischen Theorie zu verstehen.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 17
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird eine Anordnung zur Darstellung von wasserfreiem TiCl3 in Anlehnung an die Apparatur von SCHUMB u. Mitarb.(2)(3) beschrieben, die ein grobkristallines Produkt in guter Ausbeute liefert. Das Absorptionsspektrum wäßriger TiCl3-Lösungen, die im wesentlichen Hexaquo-Ionen [Ti(H2O)6]3+ enthalten, wurde neu vermessen. Weiterhin wurden die Absorptionseigenschaften von Lösungen von TiCl3 in absolutem Methanol und Äthanol, in denen die Hexaalkoholatokomplexe [Ti(CH3OH)6]3+ und [Ti(C2H5OH)6]3+ vorhanden sind, ermittelt. Die Darstellung des kristallisierten Titan(III)-hexa-isopropyl-alkoholato-chlorids [Ti(isopr.)6]Cl3 wird beschrieben.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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