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  • Articles: DFG German National Licenses  (8)
  • Polymer and Materials Science  (8)
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  • Articles: DFG German National Licenses  (8)
Material
Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Near-field Optical Spectroscopy of Single GaAs Quantum Wires (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 583-592 
    Details
    ISSN: 0142-2421
    Keywords: near-field microscopy ; semiconductors ; quantum wires ; photoluminescence spectroscopy ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The nanoscopic room temperature optical properties of single quantum wires are characterized by a combination of near-field photoluminescence and photoluminescence excitation spectroscopy. Single GaAs quantum wires with a 50 nm lateral dimension are grown at the edge of 15 nm high mesa stripes on patterned GaAs(311) surfaces. Wire formation relies on the preferential migration of Ga atoms from a GaAs layer on the mesa top and bottom towards the sidewall. Spatially resolved photoluminescence spectra separate quantum wire and quantum well emission and image the diffusion of photoexcited carriers into the wires. Photoluminescence excitation spectra give insight into the absorption spectrum of the wires and the spectral position of different interband transitions in the one-dimensional carrier system. They allow the change in local thickness of the GaAs quantum well due to the migration process to be monitored directly with subwavelength spatial resolution. Both the trapping of carriers into the wire and the detrapping of carriers generated within the wire into the surrounding quantum well states are separately resolved.© 1997 John Wiley & Sons, Ltd.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Morphological studies of extruded linear polyethylene by raman spectroscopy (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 579-581 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die von Strobl und Hagedorn angegebene Methode zur ramanspektroskopischen Charakterisierung der Polyethylenstruktur wurde auf gereckte Proben unterschiedlicher Trübung angewandt. Die Abhängigkeiten der Masseanteile der orthorhombisch-kristallinen, der amorphen und der Zwischenphase vom Reckverhältnis werden diskutiert.
    Notes: The method described by Strobl and Hagedorn for analysing the structure of polyethylene by means of Raman spectroscopy has been applied to drawn samples of different turbidity. The dependence of the mass fractions of the orthorhombic crystalline, the amorphous, and the intermediate phases on the draw ratio is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010381008
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ramanspektroskopische Charakterisierung der übermolekularen Struktur von Polyethylenen (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 220-223 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The fractions of the supermolecular structure with respect to a three-phase model were estimated by Raman spectroscopic investigations on different polyethylenes. The temperature dependence of the structure parameters is discussed. The results are compared with crystallinity values from desity, infrared, WAXS and NMR measurements.
    Notes: Für verschiedene Polyethylene werden ramanspektroskopisch die Anteile der übermolekularen Struktur nach einem Dreiphasenmodell bestimmt, und deren Temperaturabhängigkeit wird diskutiert. Die Ergebnisse werden mit Kristalliniatätswerten aus Dichte-, Infraot-, Röntgenweitwinkel- und NMR-Messungen verglichen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010380403
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of temperature on the supermolecular structure of polyethylene - a Raman spectroscopic study (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 337-338 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420712
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    NMR-Untersuchungen zu Struktur und Beweglichkeit von substituierten Polyacetylenen (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 522-527 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(bis-methylthio-acetylene) and poly(bis-ethylthio-acetylene) were investigated by 13C-NMR with respect to the structure of the main chain and the mobility of the side chains. The main chain consists of sp2-hybridized carbon atoms. The 1,2-bisalkylthylen units build up a nonplanar polymer backbone, which does not show any discrete configurations. In poly(bis-methylthio-acetylene) the MeS units undergo a rotational diffusion motion with a resorentation rate of about 70 kHz. The electron spin dynamics have on importance within the main chain.
    Notes: Poly(bis-methylthio-acetylen) und Poly(bis-ethylthio-acetylen) wurden hinsichtlich der Struktur der Hauptkette und der Beweglichkeit der Seitenketten mittels 13C-NMR-Spektroskopie untersucht. Die Hauptkette bestecht aus sp2- hydridisierten C-Atomen. Die 1,2-Bisalkythioethylen-Einheiten bilden ein nicht-Planares Polymerrückgrat, für das keine distreten Konfigurationen nachzuweisen sind. In Poly(bis-methylthio-acetylen) führen die MeS-Einheiten eine Rotationsdiffusionsbewegung von etwa 70 kHz aus. Innerhalb der Hauptkette hat die Elektronenspindynamik keine Bedeutung.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010411003
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Organische Elektronenleiter und Vorstufen. XIII. Untersuchungen zum thermischen Verhalten von Poly(bis-alkylthio-acetylen)en (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 615-620 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The thermal properties of poly(bis-alkylthio-acetylene)s in the temperature range from 30°C to 600°C have been investigated. On the basis of thermal analysis, 13C-solid state NMR and ESR spectroscopic measurements on the solid phases and gas chromatographic characterization of the volatile pyrolysis products, possible pyrolysis reactions are formulated. A simple kinetic model of the thermal behaviour of poly(bis-methylthio-acetylene) in a wide range of temperature and time is suggested.
    Notes: Das thermische Verhalten der Poly(bis-alkylthio-acetylen)e wurde im Temperaturbereich von 30°C bis 600°C untersucht. Aus den Ergebnissen der thermischen Analyse, aus 13C-Festkörper-NMR- und ESR-Messungen an den festen Thermolyserückständen und der Untersuchung der flüchtigen Pyrolyseprodukte werden mögliche Abbaureaktionen abgeleitet. Für einen weiten Zeit- und Temperaturbereich wird für Poly(bis-methylthio-acetylen) ein einfaches kinetisches Modell formuliert.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010421201
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    133. Poröses Silicium - ein Material der Mikrosystemtechnik (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1132-1133 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306509135
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Waveguide Effect on the Image Formation Process in Near-field Photocurrent Spectroscopy of Semiconductor Laser Diodes (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 573-582 
    Details
    ISSN: 0142-2421
    Keywords: near-field microscopy ; laser diodes ; photocurrent spectroscopy ; optics ; semi-conductor lasers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Near-field photocurrent spectra of high-power laser diode arrays with different wave-guide characteristics are reported. Subwavelength spatial resolution is achieved by using a near-field fibre probe as the excitation source. The effect of the laser diode waveguide structure and of surface recombination processes on the near-field photocurrent image formation is discussed and analysed in terms of a beam propagation model. Experiments on laser diodes before and after accelerated ageing demonstrate the potential of the technique for analysing microscopic defect formation processes in optoelectronic devices.© 1997 John Wiley & Sons, Ltd.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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