Anomaly of the rotational nonergodicity parameter of glass formers probed by high field electron paramagnetic resonance

被引：7
作者：
Bercu, V. [1 ,2 ,3 ]
Martinelli, M. [2 ]
Massa, C. A. [2 ]
Pardi, L. A. [2 ]
Roessler, E. A. [4 ]
Leporini, D. [1 ,5 ]
机构：
[1] Univ Pisa, Dipartimento Fis Enrico Fermi, I-56127 Pisa, Italy
[2] CNR, IPCF, I-56124 Pisa, Italy
[3] Univ Bucharest, Dept Phys, RO-76900 Bucharest, Romania
[4] Univ Bayreuth, D-95440 Bayreuth, Germany
[5] CNR, INFM, SOFT, I-56127 Pisa, Italy
来源：
JOURNAL OF CHEMICAL PHYSICS | 2008年 / 129卷 / 08期
关键词：
D O I：
10.1063/1.2973660
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Exploiting the high angular resolution of high field electron paramagnetic resonance measured at 95, 190, and 285 GHz we determine the rotational nonergodicity parameter of different probe molecules in the glass former o-terphenyl and polybutadiene in a model-independent way. Our results clearly show a characteristic change in the temperature of the nonergodicity parameter proving a rather sharp dynamic crossover in both systems, in contrast to previous results from other techniques. (c) 2008 American Institute of Physics.
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页数：5
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