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  • 1980-1984  (8)
  • 1965-1969  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    Einfluß von γ-Strahlung auf dielektrische und mechanische Eigenschaften von Polymethylmethacrylat und Polypropylen (1968)
    Springer
    Colloid & polymer science 225 (1968), S. 121-124 
    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
    Description / Table of Contents: Summary The dielectric and mechanical loss factors and the dielectric constant of two high-polymers (polypropylene and polymethylmethacrylate) were investigated after γ-irradiation (maximum dose 5·107 R). The measurements were done in the frequency range between 50 c/s and 104 c/s and in the temperature range between 20 °C and 140 °C. For polypropylene the loss factor was enlarged and a shift of the dielectric loss factor maximum to higher temperatures was observed. The half-width of the dielectric loss factor of PMMA increased slightly due to γ-irradiation.
    Notes: Zusammenfassung Die dielektrischen und mechanischen Verlustfaktoren und die Dielektrizitätszahl wurden an zwei Hochpolymeren (Polypropylen und Polymethylmethacrylat) unter Einfluß von γ-Strahlung (maximale Dosis 5·107R) bei Frequenzen zwischen 50 und 104 Hz gemessen. Es zeigte sich eine sehr starke Vergrößerung der Verluste bei Polypropylen im Bereich der Meßtemperatur zwischen 20 und 140°C. Weiterhin konnte eine leichte Verschiebung des Verlustfaktordispersionsbereiches zu höheren Temperaturen beobachtet werden. Die untersuchten dielektrischen und mechanischen Eigenschaften von PMMA änderten sich demgegenüber nur sehr wenig. Es wurde jedoch eine leichte Vergrößerung der Halbwertsbreite des Verlustfaktordispersionsgebietes mit steigender γ-Dosis festgestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02086185
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  • 2
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1967)
    Springer
    Naturwissenschaften 54 (1967), S. 651-652 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01142438
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  • 3
    Electronic Resource
    Electronic Resource
    Triplet-singlet interaction in the 1s 2s3S1 hyperfine splitting of he-like Li+ (1983)
    Springer
    The European physical journal 313 (1983), S. 147-150 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure (hfs) interaction between the metastable 23 S 1 and 21 S 0 states in6, 7Li+ causes very small equal and opposite energy level shifts,δ, in the two levels having the same total angular momentum quantum numberF=I. This amounts to 12ppm with respect to the total hfs splitting of 30 GHz for the7Li+ 23S1 state and has been measured for the first time directly for the case of a core-free electronic system by combined laser-microwave spectroscopy. A new calculation ofδ with accurate integral-transform 21 S 0 and 23S1 wave functions is reported. Configuration interactions and electron exchange and correlation effects, which differ for parallel (3 S 1) and antiparallel (1 S 0) spins, are treated in detail in order to obtain very good agreement between measured and theoretical values for this tiny perturbation. A complete understanding ofδ is indispensable for extracting fundamental constants from two-electron spectroscopic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01417220
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear spectroscopy (1982)
    Springer
    Applied physics 28 (1982), S. 81-91 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 07.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697833
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  • 5
    Electronic Resource
    Electronic Resource
    Der Einfluß von60Co-Strahlung auf die dielektrischen Eigenschaften von Polyamiden bei 10 GHz (1969)
    Springer
    Colloid & polymer science 235 (1969), S. 1171-1173 
    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
    Description / Table of Contents: Summary The dielectric properties of two polyamide-samples (6.- and 6.10-polyamide) are investigated at 10 GHz during and after60Co-γ-radiation (doses ≦ 8 · 108 R) at temperatures between 77 and 360 K. The irradiation caused changes in lattice bond and the decrease in crystallinity was observed by means of the temperature dependences of the relative dielectric constant and of the dielectric loss factor. The glass transition temperatures of both substances are enhanced with increasingγ-dose.
    Notes: Zusammenfassung An zwei Polyamiden (6.- und 6.10-Polyamid) wurden die dielektrischen Eigenschaften bei 10 GHz im Temperaturbereich von 77–360 K bei Bestrahlung mit60Co-Gammastrahlung bis zu einer Dosis von 9 · 108 R bestimmt. Die durch Bestrahlung eintretende Vernetzung und die Zerstörung der Kristallinität konnten aus der Temperaturabhängigkeit von relativer Dielektrizitätszahl und dielektrischem Verlustfaktor abgelesen werden. Die Glasübergangstemperaturen der beiden Stoffe vergrößerten sich mit wachsender Gammadosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01542523
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  • 6
    Electronic Resource
    Electronic Resource
    Laser-microwave spectroscopy of lithium ions: 23 S 1 hyperfine structure of7Li+ (1981)
    Springer
    The European physical journal 300 (1981), S. 25-30 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure (hfs) splittings of the metastable 1s2s 3 S 1 state of7Li+ have been measured with combined laser optical pumping and microwave resonance. A lowenergy Li+ ion beam, optically excited by an intersecting laser beam, passed a waveguide where radio frequency transitions were induced. The resulting population transfer among the hfs levels of the3 S 1 was detected via the change in intensity of the fluorescence light from a second crossing region of laser light and ion beam located past the waveguide. The magnetic hfs constantA(7Li+, 1s2s 3S1) was measured and compared with theory. A deviation of the two transition frequenciesν(F=3/2−F=5/2) andν(F=1/2−F=3/2) from the interval rule is due to a depression of theF=3/2 hfs sublevel, caused by mixing of the 23 S 1 and 21 S 0 states via hyperfine interaction. This shift was never observed so far in a two-electron spectrum, because of absence ofI〉1/2 isotopes in He, the only two-electron atom investigated spectroscopically with high precision. The size of the shift is in fair agreement with a theoretical estimate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412610
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  • 7
    Electronic Resource
    Electronic Resource
    Plasma oxidation of liquids (1984)
    Springer
    Plasma chemistry and plasma processing 4 (1984), S. 285-295 
    Details
    ISSN: 1572-8986
    Keywords: Plasma oxidation ; liquids ; organic materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Liquid 2,2,4-trimethylpentane (I), 1-octene (II), and di-n-butylsulfide (III) were subjected to plasma of oxygen. II and III were also treated dissolved in alkanes. Conversion rates increased with decreasing temperature, with increasing gas velocity, and, in the case of II, also with the addition of nitrogen or helium to the gas stream. The selectivity of product formation is far superior to plasma oxidations in the gas phase, making these techniques attractive for preparative chemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568982
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  • 8
    Electronic Resource
    Electronic Resource
    Laser-microwave spectroscopy in the excited 1s2s3S1 and 1s2p3P hyperfine multiplets of helium-like6,7Li+ (1983)
    Springer
    Hyperfine interactions 15 (1983), S. 159-162 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02159731
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  • 9
    Electronic Resource
    Electronic Resource
    Organische Synthesen im Plasma von Hochspannungsentladungen (1968)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 202-203 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19680800528
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  • 10
    Electronic Resource
    Electronic Resource
    Nucleophilie und Basizität von Aminen (1965)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 77 (1965), S. 739-739 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19650771669
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