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氯化铵中接近三临界点和二级相变的内模的拉曼频移。

Raman frequency shifts of an internal mode near the tricritical and second order phase transitions in NH4Cl.

作者信息

Yurtseven H, Tümkaya M H

机构信息

Department of Physics, Middle East Technical University, Ankara 06531, Turkey.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2005 Dec;62(4-5):926-30. doi: 10.1016/j.saa.2005.01.031. Epub 2005 Aug 11.

DOI:10.1016/j.saa.2005.01.031
PMID:16099199
Abstract

This study gives our analysis for the frequency shifts of the v2 (1708 cm-1) Raman mode in NH4Cl close to its tricritical (P=1.6 kbar) and second order (P=2.8 kbar) phase transitions. From our analysis, we extract the values of the critical exponent which describes the critical behavior of the Raman frequency shifts for this internal mode for the pressure conditions studied in NH4Cl. Our exponent value of alpha approximately 0.2 for the tricritical phase transition is close to the values of 1/16 (T<Tc) and 1/8 (T>Tc) for the specific heat, predicted from a 3D Ising model. Our exponent values for the second order phase transition (P=2.8 kbar) for TTc are comparable with those reported in earlier studies.

摘要

本研究给出了我们对氯化铵中v2（1708 cm-1）拉曼模式在接近其三重临界（P = 1.6 kbar）和二级（P = 2.8 kbar）相变时频率偏移的分析。通过我们的分析，我们提取了临界指数的值，该指数描述了在氯化铵中所研究压力条件下此内禀模式的拉曼频率偏移的临界行为。对于三重临界相变，我们得到的α指数值约为0.2，这与三维伊辛模型预测的比热在T < Tc时的1/16和T > Tc时的1/8的值相近。我们得到的二级相变（P = 2.8 kbar）在T < Tc和T > Tc时的指数值与早期研究报道的值相当。

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