Article2010

On the Use of Overtone and Combination Bands for the Analysis of the CaSO4—H2O System by Mid-Infrared Reflection Spectroscopy

Francesca Rosi · Alessia Daveri · Brenda Doherty · Sabrina Nazzareni · Brunetto Giovanni Brunetti · Antonio Sgamellotti +1 more

82 citations0/0 files storedApplied Spectroscopy

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Cultural Heritage Materials Analysis Spectroscopy and Chemometric Analyses Spectroscopy Techniques in Biomedical and Chemical Research

Abstract

With the aim of characterizing ground preparations of paintings by infrared reflection spectroscopy, the CaSO(4)-H(2)O system (gypsum/bassanite/anhydrite) has been re-investigated, evaluating and assigning the SO(4)(2-) and OH overtone and combination bands, respectively, in the ranges 1900-2700 cm(-1) and 5000-6000 cm(-1) resulting from reflection and high concentration transmission spectra. The second-order modes have been proven to be highly specific, reliable, and less affected by overlap with bands of organic binders and can hence be exploited for the identification of the sulfate hydration phase using infrared (IR) reflection spectroscopy. Subsequently, the characterization and identification of hydration phases in unknown sulfate-based ground preparations on authentic artworks have been carried out noninvasively by fiber-optic reflection IR spectroscopy and on cross-sections by infrared reflection micro-spectroscopy. The spectroscopic data collected both on standards and artworks have been cross-validated by X-ray diffraction.

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References

2009FT-NIR spectroscopy for non-invasive identification of natural polymers and resins in easel paintings 2008ATR-FTIR imaging for the analysis of organic materials in paint cross sections: case studies on paint samples from the National Gallery, London 2001The analysis of polychrome works of art: 40 years of infrared spectroscopic investigations 2006Non-invasive identification of surface materials on marble artifacts with fiber optic mid-FTIR reflectance spectroscopy

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