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

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Abstract:

With the aim of characterizing ground preparations of paintings by infrared reflection spectroscopy, the CaSO4–H2O system (gypsum/bassanite/anhydrite) has been re-investigated, evaluating and assigning the SO4 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.

Keywords: ANHYDRITE; ART CONSERVATION; BASSANITE; COMBINATION BANDS; FIBER-OPTIC INFRARED; GYPSUM; INFRARED SPECTROSCOPY; IR SPECTROSCOPY; MICRO-INFRARED SPECTROSCOPY; OVERTONES; PAINTING GROUNDS

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210792080975

Affiliations: 1: SMAArt, Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia; INSTM Operative Unit of Perugia, c/o Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia 2: SMAArt, Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia 3: Dipartimento di Scienze della Terra, Piazza Università 1, 06100 Perugia 4: SMAArt, Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia; INSTM Operative Unit of Perugia, c/o Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia; CNR-ISTM Istituto CNR di Scienze e Tecnologie Molecolari, c/o Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia 5: SMAArt, Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia; INSTM Operative Unit of Perugia, c/o Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia; CNR-ISTM Istituto CNR di Scienze e Tecnologie Molecolari, c/o Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia 6: SMAArt, Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia; CNR-ISTM Istituto CNR di Scienze e Tecnologie Molecolari, c/o Dipartimento di Chimica, Via Elce di Sotto, 8 06123 Perugia

Publication date: August 1, 2010

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