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首页> 外文期刊>The Journal of Chemical Physics >ISOTROPIC AND ANISOTROPIC RAMAN SCATTERING FROM MOLTEN LICL-CSCL MIXTURES - COMPOSITION AND TEMPERATURE EFFECTS
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ISOTROPIC AND ANISOTROPIC RAMAN SCATTERING FROM MOLTEN LICL-CSCL MIXTURES - COMPOSITION AND TEMPERATURE EFFECTS

机译：熔融LICL-CSCL混合物的各向同性和各向异性拉曼散射-组成和温度效应

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摘要

Molten mixtures of lithium chloride and cesium chloride have been studied using Raman spectroscopy at temperatures up to 850 degrees C. Reduced isotropic and anisotropic Raman relative intensities have been measured at different compositions and temperatures. The spectra of the mixtures show two bands with ''characteristic'' frequencies omega(Cs) and omega(Li) close to the frequencies of the bands of the pure components. Both omega(Cs) and omega(Li) shift to higher energies with increasing mole fraction of CsCl and LiCl, respectively. The scattering intensity spectra of the mixtures are compared with the simulated additive spectra of the component salts, Increasing temperature increases drastically the isotropic intensity of the omega(Li) band but has minor effects on the anisotropic intensities. The data are discussed and interpreted in terms of interaction-induced polarizability fluctuations. Short range overlap interactions, mainly between Li+ and Cl-, and the ''symmetry'' of the local structure around the anion determine the breathing-like fluctuations which contribute to isotropic scattering and account for the drastic temperature and composition dependence of the Raman intensities. The main contribution to anisotropic scattering arises from near-neighbor dipole-induced-dipole interactions between the highly polarized Cs+ and Cl- ions. (C) 1996 American Institute of Physics. [References: 36]
机译：已经使用拉曼光谱在高达850摄氏度的温度下研究了氯化锂和氯化铯的熔融混合物。已经在不同的组成和温度下测量了降低的各向同性和各向异性拉曼相对强度。混合物的光谱显示出两个带，其“特征”频率为omega（Cs）和omega（Li），与纯组分的带频率相近。随CsCl和LiCl摩尔分数的增加，ω（Cs）和omega（Li）都转移到更高的能量。将混合物的散射强度光谱与组分盐的模拟累加光谱进行了比较，温度升高使ω（Li）谱带的各向同性强度急剧增加，但对各向异性强度的影响较小。根据相互作用引起的极化率波动来讨论和解释数据。短程重叠相互作用（主要在Li +和Cl-之间）以及阴离子周围局部结构的“对称性”决定了类似于呼吸的波动，这些波动导致各向同性散射，并解释了拉曼强度的剧烈温度和成分依赖性。各向异性散射的主要贡献来自于高度极化的Cs +和Cl-离子之间的近邻偶极子诱发的偶极子相互作用。 （C）1996年美国物理研究所。 [参考：36]

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