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  • Articles: DFG German National Licenses  (3)
  • PACS. 42.50.Fx Cooperative phenomena; superradiance and superfluorescence - 03.65.Sq Semiclassical theories and applications  (2)
  • Alternating Copolymerization  (1)
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  • Articles: DFG German National Licenses  (3)
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Years
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 260 (1982), S. 995-998 
    ISSN: 1435-1536
    Keywords: Alternating Copolymerization ; Styrene ; Benzylmethacrylate ; Tacticity
    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: Abstract The alternating copolymerization of styrene and benzylmethacrylate shows a different behaviour at the beginning of the reaction and later on. Thus the composition and the intrinsic viscosity of the products as well as the reaction rate become constant only after the initial stage. The1H-NMR-spectra of alternating and statistical copolymers with equal composition show distinct differences. The spectrum of the alternating copolymer confirms the alternating structure as well as an atactic chain configuration.
    Notes: Zusammenfassung Die alternierende Copolymerisation von Styrol und Benzylmethacrylat in Gegenwart von Ethylaluminiumsesquichlorid als Katalysator zeigt im Anfangsstadium der Reaktion ein vom weiteren Verlauf abweichendes Verhalten. So nehmen die Zusammensetzung und die Grenzviskositäten der Produkte sowie die Reaktionsgeschwindigkeit erst nach der Anfangsphase konstante Werte an. Die1H-NMR-Spektren von alternierenden und statistischen Copolymeren gleicher Bruttozusammensetzung zeigen deutliche Unterschiede. Das Spektrum des alternierenden Copolymeren bestätigt die alternierende Struktur und spricht gleichzeitig für einen ataktischen Kettenaufbau.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 2 (1998), S. 165-173 
    ISSN: 1434-6079
    Keywords: PACS. 42.50.Fx Cooperative phenomena; superradiance and superfluorescence - 03.65.Sq Semiclassical theories and applications
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A well known description of superradiance from pointlike collections of many atoms involves the dissipative motion of a large spin. The pertinent “superradiance master equation” allows for a formally exact solution which we subject to a semiclassical evaluation. The clue is a saddle-point approximation for an inverse Laplace transform. All previous approximate treatments, disparate as they may appear, are encompassed in our systematic formulation. A byproduct is a hitherto unknown rigorous relation between coherences and probabilities. Our results allow for generalizations to spin dynamics with chaos in the classical limit.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 3 (1998), S. 1-8 
    ISSN: 1434-6079
    Keywords: PACS. 42.50.Fx Cooperative phenomena; superradiance and superfluorescence - 03.65.Sq Semiclassical theories and applications
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The master equation for a damped spin well known from the theory of superradiance, is written as a finite-difference equation and solved by a WKB-like method. The propagator thus obtained looks like the van Vleck propagator of a certain classical Hamiltonian system with one degree of freedom. A new interpretation is provided of the temporal broadening of initially sharp probability distributions as the analogue of the spreading of the quantum mechanical wave packet.
    Type of Medium: Electronic Resource
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