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  • 1990-1994  (3)
  • 1980-1984  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Room-temperature phosphorescence and delayed charge-transfer fluorescence of coronene adsorbed on .gamma.-alumina (1983)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 87 (1983), S. 4872-4877 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150642a022
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and spectroscopic characterization of a thin polymer film in ultra high vacuum: 2,5-distyrylpyrazine (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3235-3241 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The UHV-preparation and -characterization of thin, highly ordered polymer films of 2,5-distyrylpyrazine is reported. Monomer films were evaporated from a Knudsen cell. Subsequent photo-oligomerization occurs by illumination with UV light. The desorption behavior of the monomers and the lower oligomers was studied by temperature-programmed desorption mass spectrometry (TDS). The photoreaction was monitored in situ by high resolution electron energy loss spectroscopy (HREELS) in the range of electronic transitions. The information obtained from the loss spectra are compared to those from absorption and fluorescence spectroscopy. The results are discussed in the framework of the calculated electronic structure of related compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459793
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic transitions in α-oligothiophene thin films. Comparison of ultraviolet/visible absorption spectroscopy and high resolution electron energy loss spectroscopy investigations (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 6344-6352 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vapor deposited thin films of a series of α-oligothiophenes are investigated comparatively with polarized ultraviolet/visible absorption spectroscopy (UV/VIS) and by high resolution electron energy loss spectroscopy (HREELS) in specular reflection geometry. The complementary selection rules of these methods allow an assignment of the observed absorption and loss bands according to a Hückel molecular orbital model. By plotting the transition energies of corresponding bands of different members of the homologous series vs the reciprocal of the number of rings, the development of the one-dimensional "π-band-structure'' with an increasing number of rings could be followed. The extrapolation to infinite chain length leads to the electronic properties of an ideal (defect free) polythiophene. Furthermore, characteristic differences were observed in the results obtained from the two methods. The orientation of the molecules in thin films is only detectable with UV/VIS spectroscopy. It is most pronounced for α-quinquethiophene. On the other hand, HREELS gives information about the position of optical parity forbidden electronic transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468458
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    In situ characterization of electrochemically-formed oxide films on low carbon steel by diffuse reflectance spectroscopy (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 695-700 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The mechanism of corrosion of steel and iron is studied by the combination of cyclic voltammetry and diffuse reflectance absorption spectroscopy (DRS). The method is especially valuable to investigate samples with rough or polycrystalline surfaces without prior preparation as it is the case for cold rolled low carbon steel. The sensitivity depends on the absorption coefficients of the oxide film. In the case of the Fe2+/Fe3+-redox-system it is possible to investigate the formation and reduction of the passive layer even with under monolayer coverage. The spectroscopic measurements allow to identify the formation of Fe2+-Fe3+-mixed oxides which are responsible for protective or non-protective films. Spectra of different modifications of iron oxide powders are also given.
    Notes: Zusammenfassung Mit Hilfe der Kombination von cyclischer Voltammetrie und der diffusen Reflexionsspektroskopie läßt sich der Mechanismus der Korrosion von Stahl und Eisen untersuchen. Die Methode ist besonders geeignet zur Untersuchung von rauhen und auch polykristallinen Oberflächen, wie es der Fall ist bei Tiefziehblechen. Die Proben können ohne Vorbehandlung wie z.B. Polieren direkt eingesetzt werden. Die Empfindlichkeit liegt beim Eisensystem bei unter monomolekularer Bedeckung des Oxids auf dem Metall. Durch die spektroskopischen Untersuchungen ist es möglich, die Bildung von Mischoxiden zu verfolgen. Diese Oxide sind verantwortlich für die Bildung von schützenden oder weniger schützenden Passivschichten. Es werden auch Beispiele von Absorptionsspektren verschiedener Modifikationen von Eisenoxiden gegeben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01226751
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetik der Lumineszenz-Thermochromie und Zuordnung der Tieftemperaturemission von Pyridino-Cu(I)-jodid (1980)
    Springer
    Colloid & polymer science 258 (1980), S. 1098-1098 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01382445
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Possibilities of kinetic analysis of micellar solutions by use of microprocessor-controlled UV/VIS-spectrometry (1982)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 311 (1982), S. 443-443 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00481807
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Application of factor analysis for the interpretation of corrosion results (1992)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 344 (1992), S. 195-198 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Explorative factor analysis is applied to measurements of a chromated aluminium alloy to describe the paint adhesion and corrosion of samples with different coating thickness. Interpretation of various measurements is difficult as the surface behaviour of the material is a superposition of complex interactions. Factor patterns of the measurements describe the independent information contained in the data, the factor scores are used to give an objective classification of the samples. The factor analysis explains the superposition of the protective effect of coating thickness and the destructive effect of defect sites in the coating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322709
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Über geordnete Perowskite mit Kationenfehlstellen. XI. Das System Ba2Gd2/3□1/3U1-xWxO6 (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 495 (1982), S. 219-231 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Ordered Perovskites with Cationic Vacancies. XI. System Ba2Gd2/3□1/3U1-xWxO6The cation deficient polymorphic perovskites Ba2Gd2/3□1/3UO6 and Ba2Gd2/3□1/3WO6 form a continuous series of mixed crystals, which crystallize over a wide range (x = 0.1 up to 0.99) in a cubic 1:1 ordered perovskite lattice. According to the investigations of the vibrational spectra, the diffuse reflectance spectra, and the photoluminescence  -  opposite to isostructural perovskites without vacancies  -  different species of UO6 and WO6 octahedra are present. Numerous differences in properties  -  e. g. an orange emission colour in comparison with a green one by absence of vacancies  -  are based upon that.
    Notes: Die beiden fehlstellenhaltigen, polymorphen Perowskite Ba2Gd2/3□1/3UO6 und Ba2Gd2/3□1/3WO6 bilden eine lückenlose Reihe von Mischkristallen, die in einem weiten Bereich (x = 0,1 bis 0,99) in einem kubischen 1:1 geordneten Perowskitgitter kristallisieren. Wie die Untersuchung der Schwingungsspektren, der diffusen Reflexionsspektren und der Photolumineszenz zeigen, liegen  -  im Gegensatz zu isostrukturellen fehlstellenfreien Perowskiten  -  mehrere Sorten an UO6- und WO6-Oktaedern vor. Hierauf sind zahlreiche Eigenschaftsunterschiede  -  z. B. eine orangefarbene Emission im Unterschied zu einer grünen bei Abwesenheit von Fehlstellen  -  zurückzuführen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824950123
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    Paper (German National Licenses)
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