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- W2060549221 abstract "We have performed a detailed dielectric investigation of the relaxational dynamics of glass-forming benzophenone. Our measurements cover a broad frequency range of 0.1 Hz to 120 GHz and temperatures from far below the glass temperature well up into the region of the small-viscosity liquid. With respect to the alpha relaxation this material can be characterized as a typical molecular glass former with rather high fragility. A good agreement of the alpha relaxation behavior with the predictions of the mode coupling theory of the glass transition is stated. In addition, at temperatures below and in the vicinity of T(g) we detect a well-pronounced beta relaxation of Johari-Goldstein type, which with increasing temperature develops into an excess wing. We compare our results to literature data from optical Kerr effect and depolarized light scattering experiments, where an excess-wing-like feature was observed in the 1-100 GHz region. We address the question if the Cole-Cole peak, which was invoked to describe the optical Kerr effect data within the framework of the mode coupling theory, has any relation to the canonical beta relaxation detected by dielectric spectroscopy." @default.
- W2060549221 created "2016-06-24" @default.
- W2060549221 creator A5000101014 @default.
- W2060549221 creator A5019875469 @default.
- W2060549221 creator A5037598212 @default.
- W2060549221 creator A5064721211 @default.
- W2060549221 date "2008-03-26" @default.
- W2060549221 modified "2023-10-16" @default.
- W2060549221 title "Broadband dielectric spectroscopy on benzophenone:<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>α</mml:mi></mml:math>relaxation,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>β</mml:mi></mml:math>relaxation, and mode coupling theory" @default.
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- W2060549221 doi "https://doi.org/10.1103/physreve.77.031506" @default.
- W2060549221 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18517387" @default.
- W2060549221 hasPublicationYear "2008" @default.