Optical Kerr-effect study of trans- and cis-1,2-dichloroethene: liquid-liquid transition or super-Arrhenius relaxation.
Optical Kerr-effect study of trans- and cis-1,2-dichloroethene: liquid-liquid transition or super-Arrhenius relaxation.
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反式和顺式 1,2-二氯乙烯的光学克尔效应研究:液-液转变或超阿累尼乌斯弛豫。
DOI:
10.1039/b918196b
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发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Turton DA
中科院分区:
文献类型:
--
作者:
Turton DA
The evidence that a molecular liquid in its thermodynamically-stable state can undergo a liquid–liquid transition (LLT) is still uncertain. Therefore, trans-1,2-dichloroethene is of interest due to reports of a LLT above the melting point [S. Kawanishi, T. Sasuga and M. Takehisa, J. Phys. Soc. Jpn., 1982, 51, 1579–1583; S. Rzoska, J. Ziolo, A. Drozd-Rzoska, J. L. Tamarit and N. Veglio, J. Phys.: Condens. Matter, 2008, 20, 244124; K. Merkel, A. Kocot, R. Wrzalik and J. Ziolo, J. Chem. Phys., 2008, 129, 074503–074508]. Ultrafast optical Kerr-effect (OKE) spectroscopy enables accurate measurement of the low-frequency modes arising from interactions in liquids and therefore should be sensitive to the change in liquid structure inherent in such a transition. In the OKE data presented here, no sharp transitions are discernible, nor are there any in calorimetry data. However, the same data do reveal that neither trans- nor cis-1,2-dichloroethene is a simple liquid: in each case, a non-Arrhenius temperature dependence (with a Debye lineshape) is observed for the α relaxation. This dependence can be fitted by the Vogel–Fulcher–Tammann (VFT) law over the measurable temperature range suggesting that at low temperature, cooperative relaxation, due to the formation of clusters or structure, is present. Accurate analysis of the OKE spectrum in the terahertz region is generally limited by approximations inherent in the models. Here the diffusional modes are convoluted with librational modes to give a more physically meaningful approximation to the inertial response.
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DOI:
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发表时间:
2000
期刊:
影响因子:
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通讯作者:
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1989
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2006
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3.4
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通讯作者:
Wynne, K
DOI:
--
发表时间:
2007
期刊:
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作者:
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通讯作者:
L. Gerward