Thyr Jakob, Edvinsson Tomas
Department of Materials Science and Engineering, Uppsala university, Box 35, 75103, Uppsala, Sweden.
Energy Materials Laboratory, Chemistry: School of Natural and Environmental Science, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.
Angew Chem Int Ed Engl. 2023 Oct 23;62(43):e202219047. doi: 10.1002/anie.202219047. Epub 2023 Sep 13.
Micro-Raman spectroscopy is an important analytical tool in a large variety of science disciplines. The technique is suitable for both identification of chemical bonds and studying more detailed phenomena like molecular interactions, material strain, crystallinity, defects, and bond formations. Raman scattering has one major weakness however: it is a very low probability process. The weak signals require very sensitive detection systems, which leads to a high probability of picking up signals from origins other than the sample. This complicates the analysis of the results and increases the risk of misinterpreting data. This work provides an overview of the sources of spurious signals occurring in Raman spectra, including photoluminescence, cosmic rays, stray light, artefacts caused by spectrometer components, and signals from other compounds in or surrounding the sample. The origins of these false Raman peaks are explained and means to identify and counteract them are provided.
显微拉曼光谱是众多科学学科中一种重要的分析工具。该技术既适用于化学键的识别，也适用于研究更详细的现象，如分子相互作用、材料应变、结晶度、缺陷和键的形成。然而，拉曼散射有一个主要缺点：它是一个概率非常低的过程。微弱的信号需要非常灵敏的检测系统，这就导致从样品以外的来源拾取信号的可能性很高。这使得结果分析变得复杂，并增加了数据误判的风险。这项工作概述了拉曼光谱中出现的虚假信号的来源，包括光致发光、宇宙射线、杂散光、光谱仪组件引起的伪像以及样品内部或周围其他化合物的信号。解释了这些虚假拉曼峰的起源，并提供了识别和抵消它们的方法。
