Structural relaxations in disordered solids below Tg: Study by thermal-cycling single-molecule spectroscopyстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 февраля 2016 г.
Аннотация:Structural relaxation processes in disordered solids on the length scale of nanometers have been studied in a broad temperature range, from 4.5 K up to the glass transition, with single-molecule spectroscopy and thermal cycling experiments. Irreversible changes of single-molecule spectra after thermal cycles were observed and attributed to relaxation processes in the local environment of the probe molecules of tetra-tert-butylterrylene in polyisobutylene (PIB) and terrylene in solid ortho-dichlorobenzene. The effects of the relaxation processes on the individual parameters of low-energy matrix excitations (tunneling two-level systems and low-frequency vibrational modes) were analyzed, as well as the temperature dependence of the efficiency of relaxation processes in PIB. The results prove that the local matrix relaxations are characterized by a spatially varying distribution of activation energies.