This article is cited in 7 papers

Dielectrics

Observation of structural relaxations in disordered solid media via spectral histories of single impurity molecules

I. Yu. Eremchev^a, Yu. G. Vainer^a, A. V. Naumov^ab, L. Kador<sup>c

a</sup> Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow
^b Moscow State Pedagogical University
^c Institute of Physics and BIMF, University of Bayreuth Bayreuth, Germany

Abstract: This paper presents the technique and results of the investigation of the structural relaxation in disordered solid media (polyisobutylene, toluene, ortho-dichlorobenzene) at temperatures below the glass transition point via the spectra and fluorescence images of single impurity fluorescent molecules (terrylene, tetra-tert-butylterrylene). Application of the thermal-cycling method has made it possible to significantly extend the temperature range of investigation (from 4.5 K to the glass transition temperature). The changes observed in individual parameters of low-energy elementary excitations of the tunneling and vibrational types due to structural relaxation processes have been studied. It has been found that there is a spatial inhomogeneity in the distribution of the activation temperatures of local relaxation processes.

Received: 20.08.2012

 English version: Physics of the Solid State, 2013, 55:4, 710–719

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