We report a thorough characterization of the glassy dynamics of benzophenone by broadband dielectric spectroscopy. We detect a well pronounced beta relaxation peak developing into an excess wing with increasing temperature. A previous analysis of results from Optical-Kerr-effect measurements on this material within the mode coupling theory revealed a high-frequency Cole-Cole peak. We address the question if this phenomenon also may explain the Johari-Goldstein beta relaxation, a so far unexplained spectral feature inherent to glass-forming matter, mainly observed in dielectric spectra. Our results demonstrate that according to the present status of theory, both spectral features seem not to be directly related.
@article{arxiv.0707.2800,
title = {Dielectric spectroscopy in benzophenone: The beta relaxation and its relation to the mode-coupling Cole-Cole peak},
author = {L. C. Pardo and P. Lunkenheimer and A. Loidl},
journal= {arXiv preprint arXiv:0707.2800},
year = {2007}
}
Comments
4 pages, 3 figures; second version as published; small changes of text according to referee suggestions; title changed according to editor's demands