Osticioli Iacopo, Wolf Martin, Anglos Demetrios
Department of Chemistry, University of Florence, Polo Scientifico e Tecnologico, via della Lastruccia 3, I-50019, Firenze, Italy.
Appl Spectrosc. 2008 Nov;62(11):1242-9. doi: 10.1366/000370208786401572.
Laser-induced breakdown spectroscopy (LIBS) provides many advantages for analysis of works of art. Both qualitative and semi-quantitative information about the elemental composition of an object can be rapidly obtained using LIBS. The time of response is on the order of a few seconds and no sample preparation is required. The possibility of performing analysis in museums and archeological sites makes LIBS particularly important; the combination of laser ablation and analysis as encountered in LIBS provides means to effectively carry out depth profiling of samples. By combining the use of a microscope, the dimension of the spot of the laser used to carry out analysis can be reduced and the spatial resolution highly improved; in this way, a very small area of the sample (on the order of 10 miccrom) can be analyzed. The aim of this work is to investigate the best working conditions in order to obtain the least amount of material removal during analysis, and, at the same time, the best quality in the spectral response for rapid and reliable identification of the elemental composition of an object. First, investigations were undertaken using metal alloys; second, the optimized LIBS conditions were used for analysis of models of painting layers prepared in the laboratory. Finally, a painting cross-section and a 19th century painted icon were analyzed using the micro-LIBS setup.
激光诱导击穿光谱技术（LIBS）在艺术品分析方面具有诸多优势。使用LIBS能够快速获取有关物体元素组成的定性和半定量信息。响应时间约为几秒，且无需进行样品制备。在博物馆和考古遗址进行分析的可能性使得LIBS尤为重要；LIBS中激光烧蚀与分析相结合，为有效进行样品深度剖析提供了手段。通过结合使用显微镜，可以减小用于分析的激光光斑尺寸并大幅提高空间分辨率；这样一来，就能对样品的非常小的区域（约10微米量级）进行分析。这项工作的目的是研究最佳工作条件，以便在分析过程中去除最少的材料，同时获得最佳的光谱响应质量，从而快速可靠地识别物体的元素组成。首先，使用金属合金进行了研究；其次，将优化后的LIBS条件用于分析实验室制备的绘画层模型。最后，使用显微LIBS装置对一幅绘画的横截面和一幅19世纪的彩绘圣像进行了分析。
