Comparative study of the Debye-Waller factor anomaly at the glass transition of 
isotopically substituted orthoterphenyls

Debus, O.; Zimmermann, Herbert; Bartsch, E.; Fujara, F.; Kiebel, M.; Petry, W.; Sillescu, Hans

doi:10.1016/0009-2614(91)87152-2

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Comparative study of the Debye-Waller factor anomaly at the glass transition of isotopically substituted orthoterphenyls

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Zimmermann, Herbert
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;
Zimmermann Group, Max Planck Institute for Medical Research, Max Planck Society;
Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Debus, O., Zimmermann, H., Bartsch, E., Fujara, F., Kiebel, M., Petry, W., et al. (1991). Comparative study of the Debye-Waller factor anomaly at the glass transition of isotopically substituted orthoterphenyls. Chemical Physics Letters, 180(3), 271-274. doi:10.1016/0009-2614(91)87152-2.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-AC7D-9

Abstract

We report on neutron-scattering measurements of the Debye—Waller factor of three isotopically substituted glassy orthoterphenyls: fully protonated, fully deuterated and selectively deuterated at the lateral phenyl rings. From the comparison of the observed anomaly in the glass transition region (β-process) found in the three systems, we can exclude any intramolecular phenyl-ring dynamics as the dominant motional mechanism for the β-process. The data thus support mode-coupling theory proposing a center-of-mass motion as precursor process of the glass transition.