Authors: Romani, A.¹; Clementi, C.²; Miliani, C.³; Brunetti, B.G.²; Sgamellotti, A.⁴; Favaro, G.¹

Source: Applied Spectroscopy, Volume 62, Issue 12, Pages 324A-362A and 1285-1399 (December 2008) , pp. 1395-1399(5)

Publisher: Society for Applied Spectroscopy

Abstract:

The prototype of a portable instrument, based on the time-correlated single-photon counting method, purposely assembled for in situ measurements of luminescence lifetimes on artwork surfaces, is here presented. Preliminary tests have been carried out using the portable instrument and the results have been compared with those obtained using a bench instrument. In this way we have proven that the prototype provides lifetime measurements with good precision. It is also shown that fluorescence lifetime determinations, coupled with steady-state fluorescence spectra, allow the distinguishing, on laboratory samples, of different red organic lakes having similar fluorescence spectra, achieving new boundaries in the nondestructive diagnosis of artwork materials. The first in situ application of the technique on an original work of art, The Book of Kells, held at Trinity College Library, Dublin, highlighted the diagnostic potential of coupled steady-state and time-resolved luminescence spectroscopy in the identification of organic colorants.

Keywords: PORTABLE INSTRUMENTATION; LUMINESCENCE LIFETIME; IN SITU MEASUREMENTS; TIME-CORRELATED SINGLE-PHOTON COUNTING TECHNIQUE; ART CONSERVATION

Document Type: Research article

DOI: http://dx.doi.org/10.1366/000370208786822250

Affiliations: 1: Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italia 2: Centro SMAArt, Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italia 3: Istituto di Scienze e Tecnologie Molecolari - CNR, c/o Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italia 4: Centro SMAArt, Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italia; Istituto di Scienze e Tecnologie Molecolari - CNR, c/o Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italia

Publication date: 2008-12-01

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