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Pre-transitional effects in the liquid—plastic phase transition of p-terphenyl

✍ Scribed by Renato Torre; Imre Sánta; Roberto Righini

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
544 KB
Volume
212
Category
Article
ISSN
0009-2614

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✦ Synopsis

A study of the orientational dynamics of liquid pterphenyl in the time domain by means of transient optical Kerr effect spectroscopy is presented. The orientational relaxation is measured at several temperatures above the liquid-plastic phase transition, following the decay from a few hundreds offs to about 700 ps. Pre-transitional effects are observed above the phase transition. Approaching the transition temperature, a bifurcation of the orientational relaxation times is present. The faster orientational time follows the Debye-Stokes-Einstein hydrodynamic theory up to the phase transition without any critical effect. The slower time shows a typical critical slowing down, in agreement with the Landau-de Gennes theory of first-order phase transitions.

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