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Relaxation Dynamics of Cascaded Linear Processes

Title data

Kador, Lothar ; Bausinger, R. ; Leopold, André ; Haarer, Dietrich ; Köhler, Werner:
Relaxation Dynamics of Cascaded Linear Processes.
In: The Journal of Physical Chemistry A. Vol. 108 (2004) . - pp. 1640-1643.
ISSN 1520-5215
DOI: https://doi.org/10.1021/jp030963v

Official URL: Volltext

Abstract in another language

In many fields of nature, a system reacts to sudden changes of an external parameter in the form of two (or more) cascaded relaxation processes, where the first step depends directly on the external parameter and the second process, which is connected with the experimental observable, is determined by the state of relaxation of the first one. It follows from linear-response theory that in this case the experiment yields a behavior which distinctly deviates from a single-exponential decay, even if each of the processes is linear and follows an exponential law. The relaxation starts with time derivative zero, which is most pronounced when the two time constants are of similar magnitude. If the experimental data are fitted with a Kohlrausch\textminusWilliams\textminusWatts (KWW) function, the fit will therefore tend to overestimate the KWW exponent β. Even β values larger than one can be obtained. As an example, the diffracted light signal in a photorefractive polymer is analyzed.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics IV > Professor Experimental Physics IV - Univ.-Prof. Dr. Werner Köhler
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Advanced Fields > Nonlinear Dynamics
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 500 Natural sciences
500 Science > 530 Physics
Date Deposited: 30 Mar 2015 06:55
Last Modified: 10 Mar 2021 13:42
URI: https://eref.uni-bayreuth.de/id/eprint/8684