Volume 46, Number 6, June II 1999
|Page(s)||815 - 820|
|Section||Condensed matter: electronic structure, electrical, magneticand optical properties|
|Published online||01 September 2002|
Positron annihilation study of a low-molecular-weight organic glass-forming liquid (BMMPC)
KFKI Atomic Energy Research Institute - 1525 Budapest, P.O.Box
2 Max-Planck-Institute of Polymer Research - Ackermannweg 10, 55128 Mainz, Germany
3 Institute of Physics, A. Mickiewicz University - Umultowska 85, 61614 Poznan, Poland
4 Department of Nuclear Chemistry, Loránd Eötvös University 1518 Budapest, P.O.Box 32, Hungary
Accepted: 15 April 1999
Positron lifetime spectra were obtained from 1,1-bis(paramethoxy-meta- methyl- phenyl)-cyclohexane (BMMPC) vs. temperature T between 23 and . At low temperatures, almost up to the glass transition at Tg, a fast pick-off annihilation mechanism is proposed for explaining the variations in the annihilation parameters of positronium (Ps). Above the Vogel temperature T0 the lifetime of o-Ps is coherently interpreted in terms of a thermodynamic model which assumes the molecules to occupy solid- and liquid-like states. The transition temperature of the model calculated from o-Ps lifetimes is significantly less by than that obtained from all other physical quantities available, including free positron lifetimes.
PACS: 78.70.Bj – Positron annihilation / 61.43.Fs – Glasses / 33.20.Fb – Raman and Rayleigh spectra (including optical scattering)
© EDP Sciences, 1999
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