| Autor: |
Stephan J. Zilker, R. I. Personov, Yu. G. Vainer, Dietrich Haarer |
| Rok vydání: |
1998 |
| Předmět: |
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| Zdroj: |
Journal of Luminescence. :157-160 |
| ISSN: |
0022-2313 |
| DOI: |
10.1016/s0022-2313(97)00199-3 |
| Popis: |
Spectroscopic techniques exhibit different sensitivities for line broadening processes in amorphous solids. Photon echo and hole-burning spectroscopy yield averages over the chromophore ensemble. At low temperatures, the results can usually be fitted with a combination of a power-law term — corresponding to the relaxations of two-level systems- and of an exponentially activated contribution of pseudo-local phonon modes. Single-molecule spectroscopy (SMS). in contrast, can resolve the behavior of single dye molecules and yields a distribution of power laws as well as of activation energies. We compare photon echo results for tetra-tert-butylterrylene (TBT) in polyisobutylene (PIB) with SMS data for the same system. The latter were used to simulate numerically the data which would be obtained in an ensemble-averaging experiment. The results of the numerical calculation can be well fitted without assuming a distribution of parameters. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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