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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 355-356 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 583-592 
    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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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 579-581 
    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
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 220-223 
    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
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 337-338 
    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
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 522-527 
    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
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  • 7
    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
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1132-1133 
    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
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 501 (1983), S. 146-152 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of BenzazarsoleBenzazarsole crystallizes in the space group Pna21 with a = 8.283, b = 5.560, c = 14.647 Å and with 4 formula units per units cell. The structure was determined by X-ray structure analysis and refined to a final R value of R = 0.04. The arsenic atom has the coordination number 2 with significantly different bond lengths to the adjacent carbon atoms (1.82 and 1.92 Å). The estimated bond lengths and the strict planarity confirm the conclusion of benzazarsole being an aromatic molecule. The structure of benzazarsole is compared with the structures of benzimidazole and benzazaphosphole.
    Notes: Benzazarsol kristallisiert in der Raumgruppe Pna21 mit den Gitterkonstanten a = 8,283, b = 5,560, c = 14,647 Å und 4 Formeleinheiten pro Elementarzelle. Die Struktur wurde mittels Röntgenkristallstrukturanalyse bestimmt und bis zu einem R-Wert von R = 0,04 verfeinert. Das Arsenatom ist zweifach koordiniert und zeigt zu den benachbarten Kohlenstoffatomen signifikant unterschiedliche Bindungslängen (1,82 und 1,92 Å). Die gefundenen Bindungslängen und die strenge Planarität stützen die Vermutung, daß Benzazarsol ein aromatisches Molekül ist. Die Struktur des Benzazarsols wird mit den Struktur en von Benzimidazol und Benzazaphosphol verglichen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 52 (1939), S. 679-681 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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