Division of Chemical and Forensic Sciences, School of Life Sciences, University of Bradford, Bradford, UK.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Oct;80(1):49-54. doi: 10.1016/j.saa.2011.01.030. Epub 2011 Feb 1.
The adoption of Raman spectroscopy as a screening technique for the presence of organic resins on diverse substrates is now being advocated for the first pass non-destructive examination of potential sites for limited sampling using other analytical techniques. The characterisation of ancient resins in art work and specimens recovered from archaeological excavations is critically dependent upon the analytical capability of Raman spectroscopy using different wavelengths of excitation from the visible to the near infrared and the interpretation of the data illustrates the advantages and limitations of the technique. Resin specimens from art works and artefacts span a period of about 7000 years of recorded history and the influence of factors such as the environmental degradation, burial deposition, reaction with associated substrates and mineral pigments on the observed Raman spectra have been assessed. The key molecular Raman spectral features that are definitive for the discrimination between contemporary resins are considered in respect of these factors and thereby illustrative of the difficulties posed for the creation of a Raman spectral database of ancient resins, in contrast with the extensive and definitive literature equivalents that are available for their mineral pigment and organic dye analogues.
现在提倡将拉曼光谱作为一种筛选技术，用于检测不同基质上有机树脂的存在，以便在使用其他分析技术进行有限采样的潜在地点进行首次非破坏性检查。艺术作品和考古发掘中回收的标本中古代树脂的特征在很大程度上取决于拉曼光谱的分析能力，该光谱使用从可见光到近红外的不同波长的激发，并且数据的解释说明了该技术的优点和局限性。艺术作品和文物中的树脂标本跨越了大约 7000 年的历史记录，已经评估了环境退化、埋藏沉积、与相关基质和矿物颜料反应等因素对观察到的拉曼光谱的影响。考虑到这些因素，对可用于区分现代树脂的关键分子拉曼光谱特征进行了考虑，从而说明了为创建古代树脂的拉曼光谱数据库所带来的困难，与广泛存在的、明确的矿物颜料和有机染料类似物的拉曼光谱文献等同物形成了鲜明对比。
