Comparison of photon echo, hole burning, and single molecule spectroscopy data on low-temperature dynamics of organic amorphous solids

Autor:	R. I. Personov, Lothar Kador, Stephan J. Zilker, Yuri G. Vainer, J. Friebel, M. A. Kol'chenko
Rok vydání:	1998
Předmět:	chemistry.chemical_classification Coupling Photon Chemistry Dephasing Doping Analytical chemistry General Physics and Astronomy Polymer Physical and Theoretical Chemistry Atmospheric temperature range Dispersion (chemistry) Amorphous solid
Zdroj:	The Journal of Chemical Physics. 109:6780-6790
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.477324
Popis:	A joint analysis of spectroscopic data obtained at liquid–helium temperatures by three line-narrowing techniques, photon echo (PE), persistent hole burning (HB), and single molecule spectroscopy (SMS), is presented. Two polymer systems, polyisobutylene (PIB) and polymethylmethacrylate (PMMA), doped with tetra-tert-butylterrylene (TBT) were studied via PE and HB techniques and the results are compared with literature data [R. Kettner et al., J. Phys. Chem. 98, 6671 (1994); B. Kozankiewicz et al., J. Chem. Phys. 101, 9377 (1994)] obtained by SMS. Both systems behave quite differently. In TBT/PIB a rather strong influence of a dispersion of the dephasing time T2 was found which plays only a minor role in TBT/PMMA. We have also measured the temperature dependence of T2 for both systems in a broad temperature range (0.4–22 K). Using these data we separated the two different contributions to the optical dephasing — due to an interaction with two-level systems and due to coupling with local low-frequency modes. ...
Databáze:	OpenAIRE
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