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  • 1990-1994  (3)
  • 36.10.Gv  (2)
  • Polymer and Materials Science  (1)
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  • 36.10.Gv  (2)
  • Polymer and Materials Science  (1)
  • Chemistry  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 341 (1991), S. 101-105 
    ISSN: 1434-601X
    Keywords: 36.10.Gv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Absolute pionic x-ray intensities have been measured for Mg and Fe. The accuracy achieved was 2% of the line intensity for the most prominent transitions. In the Balmer series of Mg and the Paschen series of Fe the crossover transitions were found to be even more attenuated than the transitions between circular states, as deduced, for example, by comparison with muonic atoms; no crossover transitions were observed in the Fe Balmer series. According to cascade calculations based on the experimental intensities more than half of the pions are absorbed in Fe already from levels with principal quantum numbern〉17 by strong interaction.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 346 (1993), S. 81-84 
    ISSN: 1434-601X
    Keywords: 36.10.Gv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spectral flux densityn(T) of μ− emerging from a Au or MgF2 moderator has been measured at low energiesT using time-of-flight. Fromn(T) the stopping powerS(T) of Au was determined for 2 keV≤T≤22 keV, and of MgF2 for 2 keV≤T≤12 keV. For Au,S(T) is smaller than calculated values obtained from proton atomic data practically in the wholeT range (Barkas effect); at lowT S(T) approaches the calculated values. For MgF2,S(T) agrees fairly with the calculated values above 5 keV and then drops below these values. We ascribe this dropping to the large energy gap of the MgF2 insulator.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 639-645 
    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: Current carriers can cause currents after variation of the external electrical field, which depend on time just as relaxed dipols. The intensity and the position of the relaxation region and especially the nonlinear dependence between the stored charge and the external field are criterions for this. Blocking contacts cause relaxations of current carriers in poly(phenyl quinoxaline) and poly(ethylene terephthalate) samples. Detailed investigations of this phenomenon make possible informations on the density of the current carriers in the sample volume and on electrical properties of the contact region. Further ac-hopping is to be proved in poly(phenyl chinoxaline).
    Notes: Neben relaxierenden Dipolen können auch Stromträger zeitabhängige Ströme nach Änderung des äußeren elektrischen Feldes bewirken. Als Kriterien dafür werden neben Intensität und Lage des Relaxationsgebietes die nichtlineare Abhängigkeit der gespeicherten Ladung von der äußeren Feldstärke angesehen. In Poly(chinoxalin) und Poly(ethylenterephthalat) werden Stromträgerrelaxationen durch blockierende Kontakte verursacht. Detaillierte Untersuchungen erlauben Aussagen über die Stromträgerdichte im Probenvolumen und Eigenschaften der Kontaktschicht. In Poly(chinoxalin) ist weiterhin Wechselstromhopping nachweisbar.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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