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Paluch M, Pawlus S, Hensel-Bielowka S, et al. Two secondary modes in decahydroisoquinoline: which one is the true Johari Goldstein process?. J Chem Phys. 2005;122(23):234506doi: 10.1063/1.1931669.
Paluch, M., Pawlus, S., Hensel-Bielowka, S., Kaminska, E., Prevosto, D., Capaccioli, S., Rolla, P. A., & Ngai, K. L. (2005). Two secondary modes in decahydroisoquinoline: which one is the true Johari Goldstein process?. The Journal of chemical physics, 122(23), 234506. https://doi.org/10.1063/1.1931669
Paluch, M, et al. "Two secondary modes in decahydroisoquinoline: which one is the true Johari Goldstein process?." The Journal of chemical physics vol. 122,23 (2005): 234506. doi: https://doi.org/10.1063/1.1931669
Paluch M, Pawlus S, Hensel-Bielowka S, Kaminska E, Prevosto D, Capaccioli S, Rolla PA, Ngai KL. Two secondary modes in decahydroisoquinoline: which one is the true Johari Goldstein process?. J Chem Phys. 2005 Jun 15;122(23):234506. doi: 10.1063/1.1931669. PMID: 16008461.
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J Chem Phys. 2005 Jun 15;122(23):234506. doi: 10.1063/1.1931669.

Two secondary modes in decahydroisoquinoline: which one is the true Johari Goldstein process?.

The Journal of chemical physics

M Paluch, S Pawlus, S Hensel-Bielowka, E Kaminska, D Prevosto, S Capaccioli, P A Rolla, K L Ngai

Affiliations

  1. Institute of Physics, Silesian University, Uniwersytecka 4, 400-07 Katowice, Poland. [email protected]

PMID: 16008461 DOI: 10.1063/1.1931669

Abstract

Broadband dielectric measurements were carried out at isobaric and isothermal conditions up to 1.75 GPa for reconsidering the relaxation dynamics of decahydroisoquinoline, previously investigated by Richert et al. [R. Richert, K. Duvvuri, and L.-T. Duong, J. Chem. Phys. 118, 1828 (2003)] at atmospheric pressure. The relaxation time of the intense secondary relaxation tau(beta) seems to be insensitive to applied pressure, contrary to the alpha-relaxation times tau(alpha). Moreover, the separation of the alpha- and beta-relaxation times lacks correlation between shapes of the alpha-process and beta-relaxation times, predicted by the coupling model [see for example, K. L. Ngai, J. Phys.: Condens. Matter 15, S1107 (2003)], suggesting that the beta process is not a true Johari-Goldstein (JG) relaxation. From the other side, by performing measurements under favorable conditions, we are able to reveal a new secondary relaxation process, otherwise suppressed by the intense beta process, and to determine the temperature dependence of its relaxation times, which is in agreement with that of the JG relaxation.

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