Authors: Böhmer, Roland
Schiener, B.
Chamberlin, R. V.
Diezemann, G.
Title: Dielectric hole burning spectroscopy of supercooled liquids
Language (ISO): en
Abstract: The nonexponential response of propylene carbonate and glycerol near their glass transitions could be selectively altered using nonresonant spectral hole burning (NSHB) experiments. This observation provides evidence of the existence of a distribution of relaxation times in these supercooled liquids. NSHB is based on a pump, wait, and probe scheme and uses low-frequency large amplitude electrical fields to modify the dielectric relaxation. The temporal evolution of the polarization of the sample is then measured subsequent to a small voltage step. By variation of a recovery time inserted between pump and probe, the refilling of the spectral features could be monitored and was found to take place on the time scale set by the peak in the distribution. The recovery time and pump frequency dependences of the spectral modifications were successfully simulated using a set of coupled rate equations.
Subject Headings: polymers
organic compounds
optical hole burning
dielectric relaxation
glass transition
Issue Date: 1997-11-15
Provenance: American Institute of Physics
Citation: Schiener, B.; Chamberlin, R. V.; Diezemann, G.; Böhmer, R.: Dielectric hole burning spectroscopy of supercooled liquids. In: Journal of Chemical Physics Jg. 107(1997), S. 7746-7761, doi:
Appears in Collections:Böhmer, Roland Prof. Dr.

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