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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6610-6613 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analysis of the nonexponential behavior of the kinetics of the initial laser level for three-micron generation (4I11/2) in an Er3+(45 at. %):YAlO3 crystal under intense pump in the 4S3/2 level is performed. The observed nonexponential 4I11/2 decay can be satisfactorily described by the rate equation model which includes energy transfer processes inside the system of erbium ions, such as up-conversion from 4I13/2 and 4I11/2 and cross-relaxation from 4S3/2 and 4I9/2 provided only a small fraction (β21≈0.11) of the excitation from 4I11/2 level reaches the terminal laser level, 4I13/2. The low value of β21 and the observed reduction of the fluorescent lifetime of 4I11/2 with the increasing erbium doping could be related to the presence of accidental impurities. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 44 (1993), S. 152-155 
    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: Für alternierende Copolymere aus Acrylnitril und α-Methylstyren wurden in verschiedenen Lösungsmitteln die Kuhn-Mark-Houwink-Sakurada-Beziehungen bestimmt. Die Werte der ungestörten Dimensionen sowie die Konformationsparameter wurden nach den üblichen Extrapolationsverfahren ermittelt. Die ungestörten Dimensionen hängen vom Lösungsmittel ab und unterscheiden sich deutlich von den Werten, die unter Verwendung von Additivitätsregeln aus den Werten für die entsprechenden Homopolymere berechnet wurden.
    Notes: Kuhn-Mark-Houwink-Sakurada relations were obtained in various solvents for alternating copolymers from acrylonitrile and α-methylstyrene. The values of the unperturbed dimension and the conformational parameter were determined using usual extrapolation techniques. The values of the unperturbed dimensions are dependent on the solvent and are quite different from the values calculated on the basis of additivity rules from the unperturbed dimensions of the parent homopolymers.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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