The complementarity of LIBS and Raman microscopy for wall painting pigments analysis

An example of the complementarity of laser-induced breakdown spectroscopy and Raman microscopy for wall painting pigments analysis

Journal of Raman Spectroscopy 2007, 38, 909-915
Romain Bruder, Vincent Detalle, Claude Coupry

Abstract: Laser-induced breakdown spectroscopy (LIBS) and Raman microscopy were used for the identification of pigments in wall painting. Raman spectroscopy, which provides the molecular fingerprint of the compound, is nowadays widely used by the archaeometry community, especially for pigment analysis. LIBS, which provides the elementary composition of samples, is a rapid noncontact method, enabling layer-by-layer analysis through a precise laser ablation of the sample. This work deals with the behavior of pigments after a LIBS analysis, by trying to identify the compounds before and after the laser shot. Six commercial pigments prepared with the fresco technique were investigated: ultramarine blue, red lead, charcoal, a yellow and a red ochre, and a green earth. Raman spectra, acquired on the sample surface and in the crater induced by LIBS analysis, were compared. The results show that these pigments are well recognized after a LIBS measurement. The analysis of green earth illustrates that the combination of these two techniques gives complete information from a sample.

• This paper is free to view to spectroscopyNOW registered users until the end of September 2007. After this time it will be available via Wiley's Pay-Per-View service for US$25.
• Click here to access the abstract of this paper. From here you can progress to read the full paper.
• Click here for more details about Journal of Raman Spectroscopy