Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 331 (1988), S. 43-51 
    ISSN: 1434-601X
    Keywords: 24.10.Cn ; 24.60 ; 25.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show how the fluctuating part of the residual coupling between collective and intrinsic motion of a dissipative heavy-ion collision induces correlations in either subspace. They lead in general to a transport equation for the collective motion, and to a new term in the equation for the one-body density which describes collisions with the collective fluctuations. The resulting redistribution of the single-particle occupation numbers ρα and the evolution of the fluctuations are coupled with each other due to the dependence of the transition rates in the master equation on the fluctuations, and of the transport coefficients on ρα. Considering the special case of a long contact phase, we find the fluctuations to be most effective, with respect to a randomization of ρα, within a certain critical region where they pass from stable to unstable behaviour. Estimates are made for the corresponding relaxation times employing a schematic model.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0044-2313
    Keywords: Phosphanediyl ; Halogenocyclotetraphosphanes ; NMR Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In situ Generation of [PX] and Insertion into (tBuP)3, (X = Cl, Br). Synthesis of the Functionalized Cyclophosphanes (tBuP)3PX, [1-(tBu)(X)P-2,3,4-(tBu)3]P4 and Structure Analysis of (tBuP)3PClThe redox system PX3/SnX2 (X = Cl, Br) can be used as a source for the in situ generation of halogenphosphanediyl [PX]. In the presence of tri-t-butylcyclotriphosphane (tBuP)3 the intermediately formed [PX] is added to a ring P atom followed by an insertion reaction, which leads to a ring expansion, whereby monohalogenocyclotetraphosphanes (tBuP)3PX (X = Cl, Br; 1, 2) are formed. Excess [PX] does not lead to further ring expansion but through a complex reaction course to the functionalized cyclotetraphosphanes [1-(tBu)(X)P-2,3,4-(tBu)3]P4, 3 (X = Br); 7 (X = Cl). 1, 2 and 3 could be obtained in a pure form and NMR and mass spectroscopically, 7 31P-NMR spectroscopically, characterized. For 1 and 7 31P—35,37Cl-isotopic shifts could be identified. 1 was further characterized by an X-ray structure analysis.
    Notes: Das Redoxsystem PX3/SnX2 (X = Cl, Br) kann als Quelle zur in situ-Bildung von Halogenphosphandiyl [PX] verwendet werden. In Gegenwart von Tri-t-butylcyclotriphosphan (tBuP)3 wird intermediär auftretendes [PX] zuerst an ein Ring-P-Atom addiert, dann unter Ringexpansion insertiert, wobei Monohalogenocyclotetraphosphane (tBuP)3PX (X = Cl, Br; 1, 2) gebildet werden. Überschüssiges [PX] führt nicht zu einer weiteren Ringexpansion; vielmehr entstehen in einem komplexen Reaktionsverlauf die funktionalisierten Cyclotetraphosphane [1-(tBu)(X)P-2,3,4-(tBu)3]P4, 3 (X = Br); 7 (X = Cl). 1, 2 und 3 konnten in reiner Form isoliert und NMR- sowie massenspektroskopisch, 7 31P-NMR-spektroskopisch, charakterisiert werden. Bei 1 und 7 konnten 31P—35,37Cl-Isotopieverschiebungen nachgewiesen werden. Von 1 wurde eine Röntgenstrukturanalyse durchgeführt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...