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Relation between Pressure Shift and Electric-Field Shift of Single-Molecule Lines in a Polymer Glass

Title data

Bauer, M. ; Kador, Lothar:
Relation between Pressure Shift and Electric-Field Shift of Single-Molecule Lines in a Polymer Glass.
In: The Journal of Chemical Physics. Vol. 120 (2004) Issue 21 . - pp. 10278-10284.
ISSN 0021-9606
DOI: https://doi.org/10.1063/1.1737305

Abstract in another language

The pressure shifts and the electric-field shifts of individual chromophores in an amporphous matrix are—due to strong disorder—subject to broad distributions. By means of single-molecule spectroscopy we measured both the pressure and the electric-field shift of about 800 tetra-tert-butylterrylene molecules in polyisobutylene. We found a significant correlation of 0.52 (Kendall’s correlation coefficient) between the two observables. Analytical calculations and Monte Carlo simulations based on a model by Laird and Skinner predict a nonzero, yet, distinctly smaller correlation. The Monte Carlo simulations showed that the usual assumptions of a spherical shape and isotropic polarizability of the chromophores in glassy systems is an oversimplification of the complex nanoscopic structure and cannot reproduce our experimental results. By taking the molecular anisotropy into account, we obtain agreement of the simulated and the measuredcorrelation between pressure shift and electric-field shift parameter.

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
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions
Research Institutions > Research Centres
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 07:02
Last Modified: 09 Mar 2016 11:15
URI: https://eref.uni-bayreuth.de/id/eprint/8685