Hyper‐Raman spectroscopy of CeO2,Journal of Raman Spectroscopy

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Hyper‐Raman spectroscopy of CeO2
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-04-26 , DOI: 10.1002/jrs.5886
Eliel Villa‐Aleman ₁ , Amanda L. Houk ₁ , Don D. Dick ₁ , Simona E. Hunyadi Murph ₁

Affiliation

Cerium dioxide (CeO₂) belongs to the fluorite structure group (O_h⁵ point group) resulting in one Raman active T_2g mode and two IR active T_1u TO and LO modes. The T_2g Raman band in CeO₂ has been used to probe the symmetric Ce–O vibrational mode of different sized nanoparticulates. Far infrared studies of the Ce–O interactions are difficult to conduct because of low optical transmission, efficiency of the detector, and water absorption bands interfering with the measurements. The selection rules of hyper‐Raman spectroscopy (HRS) allow the study of IR bands in the far infrared spectral region, such as the motion of the Ce atoms. For the first time, HRS was used to investigate the T_1u TO and LO IR modes in CeO₂. The position and full‐width half‐maximum (FWHM) of the TO and LO bands in the HRS spectrum were used to investigate the spectral response in relation to particle size (i.e., phonon confinement). The investigation of CeO₂ with HRS provides a research platform for future work in the study of ThO₂, UO₂, and PuO₂ IR modes.

中文翻译：

CeO2的超拉曼光谱

二氧化铈（CeO ₂）属于萤石结构群（O _h⁵点群），产生一个拉曼活性T _2g模式和两个红外活性T _1u TO和LO模式。CeO _2中的T _2g拉曼带已用于探测不同尺寸纳米粒子的对称Ce–O振动模式。由于低的光学透射率，检测器的效率以及干扰测量的吸水谱带，很难进行Ce-O相互作用的远红外研究。高拉曼光谱（HRS）的选择规则允许研究远红外光谱区域的红外波段，例如Ce原子的运动。HRS首次用于研究CeO _2中的T _1u TO和LO IR模式。HRS光谱中TO和LO谱带的位置和半峰全宽（FWHM）用于研究与粒径（即声子限制）有关的光谱响应。CeO _2的研究HRS的使用为将来研究ThO ₂，UO ₂和PuO ₂ IR模式提供了一个研究平台。

更新日期：2020-04-26

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