Spectral selectivity in the slow -relaxation of a molecular glass
Department of Chemistry and Biochemistry, Arizona State
University Tempe, Arizona 85287-1604, USA
Accepted: 5 April 2001
The time-resolved electric-field relaxation in glassy D-sorbitol is measured by dielectric hole-burning, i.e. with and without a preceding high electric sinusoidal burn field. The question is whether the burn-induced modifications of the response are frequency-selective (dielectric “holes”) and thus indicative of heterogeneous dynamics, where slow and fast responses coexist in the material. For burn fields between 250 and 440 such holes in the responses are observed, whose positions shift linearly with the inverse burn frequency. Recovery time measurements indicate that these modifications of the Johari-Goldstein process in glassy D-sorbitol are long lived.
PACS: 64.70.Pf – Glass transitions / 77.22.Gm – Dielectric loss and relaxation / 61.43.Fs – Glasses
© EDP Sciences, 2001