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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Experimental problems in Raman spectroscopy applied to pigment identification in mixtures
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Experimental problems in Raman spectroscopy applied to pigment identification in mixtures

机译：拉曼光谱法在混合物中色素鉴别中的实验问题

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Raman spectroscopy provides useful information to detect and identify pictorial materials in artworks, although some problems are involved when the identification of individual pigments in mixtures is treated. With the hypothesis of the Principle of superposition, the mixture spectrum should be the direct sum of each pondered individual spectrum. In this work, we will show several mixtures where it can be noticed that the mixture spectrum is not qualitatively proportional to the sum of pondered individual spectra. Also there were some cases where the bands of one of the pigments could not be detected in the mixture spectrum. This non-linear behaviour could be attributed to specific proprieties of each material that are revealed when they interact with each other. We conjecture that, for instance, the different reflectances or the wavelength of the laser source could be determinant factors of the obtained results. In this paper an experimental method has been designed in order to characterize the quantitative behaviour of the Raman bands corresponding to each pigment in a mixture. Adequate coefficients are defined and calculated to facilitate the study of the spectral contribution of the different components of a mixture. (c) 2007 Elsevier B.V. All rights reserved.
机译：拉曼光谱法为检测和鉴定艺术品中的图片材料提供了有用的信息，尽管在处理混合物中单个颜料的鉴定时会涉及一些问题。根据叠加原理的假设，混合频谱应该是每个仔细考虑的单个频谱的直接和。在这项工作中，我们将显示几种混合物，可以注意到该混合物的光谱与所考虑的各个光谱的总和在质量上不成比例。在某些情况下，在混合物光谱中无法检测到一种颜料的谱带。这种非线性行为可归因于每种材料在彼此相互作用时显示的特定属性。我们推测，例如，不同的反射率或激光源的波长可能是获得结果的决定因素。在本文中，设计了一种实验方法来表征与混合物中每种颜料相对应的拉曼带的定量行为。定义和计算足够的系数以促进对混合物不同成分的光谱贡献的研究。 （c）2007 Elsevier B.V.保留所有权利。

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