Calibration of Raman bandwidth in large Raman images using a mercury–argon lamp,Journal of Raman Spectroscopy

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Calibration of Raman bandwidth in large Raman images using a mercury–argon lamp
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-12-02 , DOI: 10.1002/jrs.6045
Ryan S. Jakubek ₁ , Marc D. Fries ₂

Affiliation

Raman imaging has proven to be an important tool in the analysis of astromaterials. Raman imaging can describe the composition and mineralogy of astromaterials in a nondestructive manner preserving precious samples for additional study. Raman bandwidth is a common spectroscopic marker used to elucidate information such as composition, latent strain, and thermal processing history. The observed Raman bandwidth of a sample is a result of a convolution of the true Raman lineshape and the spectrometer's slit function. Thus, to compare Raman bandwidths across spectra and instruments, one needs to calibrate the Raman spectrum to account for effects of the slit function. Astromaterials are heterogeneous requiring the collection of large Raman images for adequate sampling. It is well known that the wavenumber calibration of an instrument drifts with time throughout Raman image collection. Here, we find that the spectrometer slit function also varies with time and laboratory temperature throughout Raman image collection. We utilize a mercury–argon (Hg–Ar) lamp integrated into our Raman microscope in a novel manner to calibrate the bandwidth in each Raman spectrum within our Raman image. We can do this because the narrow Hg–Ar lamp emission lines approximate the spectrometer slit function for each Raman spectrum allowing for the calculation of the true Raman bandwidth from each Raman spectrum within the Raman image. Our technique allows for the comparison of Raman bandwidth throughout a Raman image and between Raman images/spectra collected using different instruments, facilitating scientific analyses that are reproducible across multiple laboratories.

中文翻译：

使用汞-氩灯校准大拉曼图像中的拉曼带宽

拉曼成像已被证明是分析天体材料的重要工具。拉曼成像可以以非破坏性的方式描述天体材料的成分和矿物学，保留宝贵的样本以供进一步研究。拉曼带宽是一种常见的光谱标记，用于阐明诸如成分，潜在应变和热处理历史之类的信息。观察到的样品拉曼带宽是真实拉曼线形与光谱仪的狭缝函数卷积的结果。因此，为了比较整个光谱和仪器的拉曼带宽，需要校准拉曼光谱以考虑狭缝功能的影响。天体材料是异质的，需要收集大的拉曼图像以进行适当的采样。众所周知，在整个拉曼图像采集过程中，仪器的波数校准会随时间而漂移。在这里，我们发现在整个拉曼图像采集过程中，光谱仪的狭缝功能也随时间和实验室温度而变化。我们采用一种新颖的方式将汞-氩（Hg-Ar）灯集成到我们的拉曼显微镜中，以校准拉曼图像中每个拉曼光谱的带宽。我们之所以这样做，是因为窄的Hg-Ar灯发射线近似于每个拉曼光谱的光谱仪狭缝函数，从而允许从拉曼图像中的每个拉曼光谱计算出真正的拉曼带宽。我们的技术可以比较整个拉曼图像以及使用不同仪器收集的拉曼图像/光谱之间的拉曼带宽，

更新日期：2020-12-02

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