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  • 1985-1989  (6)
  • 1980-1984
  • 1930-1934
  • 1989  (6)
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  • 1985-1989  (6)
  • 1980-1984
  • 1930-1934
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    A hole burning study of excitonic states of chain molecules in glasses (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 7988-7993 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Thermal broadening of spectral holes burnt into excitonic states of long chain molecular aggregates of pseudoisocyanine iodide is investigated over a temperature range from 350 mK to 80 K. The results differ very much from the usual behavior of small molecules in glasses. We found that extended states are almost completely decoupled from the amorphous host lattice and spectral diffusion effects play a minor role. The homogeneous linewidth is independent of temperature below 10 K. Above, thermal broadening occurs in two steps: there is a weak onset around 15 K and a strong onset around 65 K. The data can be fitted by a superposition of two exponentials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457217
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Conformational transitions of long chain molecules in frozen solutions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 7296-7299 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We show by temperature-cycling-hole-burning experiments that the conformational barriers of one-dimensional long chain aggregates of pseudoisocyanine iodide in frozen solutions follow a distribution of the form Pv(V)∼1/V . This is the same distribution as has been measured for three-dimensional glasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457297
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Probing of conformational relaxation processes of proteins by frequency labeling of optical states (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1270-1273 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We show how optical frequency labeling at cryogenic temperatures can be used to probe in a most direct way protein substates and to elucidate the nature of the structural relaxation processes involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456131
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The dependence of silicon selective epitaxial growth rates on masking oxide thickness (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1713-1716 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Growth rates in selective epitaxial depositions (SEG) and epitaxial lateral overgrowth (ELO) in the SiCl2H2-HCl-H2 system were studied as a function of masking oxide thickness. Enhanced growth was observed on wafers with thin (80 nm), as compared to thick (〉300 nm), masking oxides. The higher growth rates on wafers with thin oxides were attributed to their higher surface temperature. The higher surface temperature for wafers with thin oxides is demonstrated to be due to decreased radiant heat transfer as compared to wafers with thicker oxides. The dependence of oxide thickness on growth rates was global, meaning that the bulk or large area field oxide thickness, and not the local oxide thickness in the immediate vicinity of the seed window, determined the growth rates. Hence, the dependence of growth rates on masking oxide thickness is critical in understanding, designing, and comparing experiments studying epitaxial deposition processes, but is less critical for technological applications of SEG and ELO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342943
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Stability of frequency domain information bits in amorphous organic materials (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3232-3240 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the stability of frequency domain information bits as a function of time and temperature fluctuations. A large body of experimental results for a variety of organic materials is presented and analyzed in terms of phenomenological models on spectral diffusion and dispersive kinetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344114
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Plasmaätzung von Phenolharzfasern unterschiedlicher Struktur und Vernetzung (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 19-22 
    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: Crosslinking of novolac fibres was studied by means of plasma etching in connection with light and scanning electron microscopy. With proceeding crosslinking by formaldehyde from the outer skin to the inner of the fibre a highly cross-linked shell of not more than 10 to 13 μm thickness was formed after about 8 h crosslinking time. On the other hand, more porous networks of modified novolacs permit a rapid and complete crosslinking of the fibres.
    Notes: Mittels Plasmaätzung in Verbindung mit Licht- und Rasterelektronenmikroskopie wurde der Vernetzungsverlauf von Phenolharznovolakfasern verfolgt. Bei der von außen nach innen fortschreitenden Vernetzung mit Formaldehyd bildet sich im Zeitraum von etwa 8 h eine 10 bis 13 μm dicke Schicht aus, deren Netzwerkdichte eine weitere Vernetzung des Faserinneren verhindert. Weitmaschiger aufgebaute Netzwerke modifizierter Ausgangsnovolake hingegen lassen eine schnelle und vollständige Durchvernetzung der Fasern zu.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400105
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    Paper (German National Licenses)
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