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Journal of Luminescence

Single-molecule spectroscopy, photon echoes, and hole burning in low-temperature glasses

James L. Skinner, Eitan Geva

Published Feb 1, 1998• 0 citations
Publisher
DOI
10.1016/s0022-2313(97)00151-8

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The Journal of Chemical Physics•Oct 22, 1998•31 citations
The principles of incoherent photon echoes (IPE) are shortly recalled. The results on dynamics in doped organic glasses and polymers (resorufin in d‐ and d6‐ethanol and terrylene in polyethylene) studied by IPE are presented. In all cases the fast dephasing processes are related to coupling with both two‐level systems (TLS) and pseudolocal mode. The nanosecond spectral diffusion (SD) processes has been observed. The IPE‐results are compared with hole‐burning and single molecule spectroscopy (SMS) data.
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. The data are compared with calculations using a numerical and a semianalytical model in the presence of a large dispersion of the single molecule parameters. Furthermore, we discuss the differences of the linewidths as measured by different experimental methods.