Interpretation of Raman Spectra of Oxide Materials: The Relevance of Absorption Effects
Interpretation of Raman Spectra of Oxide Materials: The Relevance of Absorption Effects
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DOI：
10.1021/acs.jpcc.7b06105
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发表时间：
2017-08
影响因子：
3.7
通讯作者：
Anastasia Filtschew;C. Hess
中科院分区：
文献类型：
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作者：
Anastasia Filtschew;C. Hess
当使用拉曼光谱对催化剂等固体粉末材料进行结构表征时，解释需要考虑可能的辐射吸收。例如，氧化物材料的还原可能导致新的紫外-可见吸收带，并因此影响拉曼强度。在共振拉曼光谱学中，基于Kubelka-Munk理论的拉曼强度的吸收校正被广泛建立。相反，在拉曼光谱中，通常不应用通过声子模式的吸收校正或归一化。利用拉曼和紫外-可见光谱的结合方法，本研究考察了吸收对拉曼光谱的影响以及不同吸收校正对拉曼光谱的有用性。结果表明，约10%的吸收变化可能导致拉曼强度降低高达三分之一。基于Kubelka-Munk理论的修正预测了低吸收区的小变化会产生大的强度变化。
When using Raman spectra for structural characterization of solid powder materials such as catalysts, the interpretation needs to take into account the possible absorption of radiation. For example, the reduction of oxide materials may result in new UV–vis absorption bands and therefore affect the Raman intensity. In resonance Raman spectroscopy, the absorption correction of Raman intensity based on the Kubelka–Munk theory is widely established. In contrast, in Raman spectroscopy, typically no absorption correction or normalization by a phonon mode is applied. Using a combined approach of Raman and UV–vis spectroscopy, this study examines the effect of absorption on Raman spectra as well as the usefulness of different absorption corrections for Raman spectroscopy. The results show that a change in absorption of about 10% may result in a decrease in Raman intensity of up to one-third. Corrections based on the Kubelka–Munk theory predict large intensity changes for small changes in the low-absorption region...