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Moments of Single-Molecule Spectra in Low-Temperature Glasses : Measurements and Model Calculations

Title data

Naumov, Andrei V. ; Vainer, Yuri G. ; Bauer, M. ; Kador, Lothar:
Moments of Single-Molecule Spectra in Low-Temperature Glasses : Measurements and Model Calculations.
In: The Journal of Chemical Physics. Vol. 116 (2002) Issue 18 . - pp. 8132-8138.
ISSN 0021-9606
DOI: https://doi.org/10.1063/1.1469603

Official URL: Volltext

Abstract in another language

Single-molecule spectroscopy of isolated chromophores in solids yields detailed information about the matrix on a microscopic level. In most studies so far, single-molecule (SM) spectra have been characterized by their linewidths. We demonstrate that in a doped amorphous polymer, in which SM excitation spectra generally have a complicated shape, the shapes of SM lines are more fully characterized by their moments than by the usually used linewidth. We present the measured and simulated distributions of the first four moments and of the linewidth for low-temperature spectra of single tetra-tert-butylterrylene molecules embedded in an amorphous poly(isobutylene) matrix. The simulations are based on the standard tunneling model of glasses with appropriate modifications and on a theory of SM line shapes in a disordered host, which was recently derived by Geva and Skinner J. Phys. Chem. B 101, 8920 (1997). The comparative analysis of the measured and simulated distributions allowed us to evaluate the minimal distance of two-level-system{\textendash}chromphore interactions and the main parameters of the distribution of coupling constants.

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 08:39
Last Modified: 18 Apr 2018 10:51
URI: https://eref.uni-bayreuth.de/id/eprint/8697