Temperature-dependent line broadening of chromophores in amorphous solids: Differences between single-molecule spectroscopy and photon echo results

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 — correspo...

Full description

Saved in:
Bibliographic Details
Published in:Journal of luminescence 1998-02, Vol.76, p.157-160
Main Authors: Zilker, S.J, Haarer, D, Vainer, Yu.G, Personov, R.I
Format: Article
Language:English
Subjects:
Glass dynamics
Photon echo spectroscopy
Single-molecule spectroscopy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0022-2313
1872-7883
DOI:10.1016/S0022-2313(97)00199-3