title: Laser-induced breakdown spectroscopy of archaeological findings with calibration-free inverse method: comparison with classical laser-induced breakdown spectroscopy and conventional techniques.
abstract: A modified version of the calibration-free (CF) method was applied to the analysis of a set of archaeological brooches made of various copper-based alloys and coming from the archaeological site of Egnatia (Apulia, Southern Italy). The developed methodology consists in determining the plasma temperature by reversing the set of equations employed in the usual CF algorithm, and it is thus referred to as "inverse method". The plasma temperature is determined for one certified standard, by using its known elemental composition as an input data, and then applied to the set of unknown samples to evaluate their composition in a CF mode. The feasibility of such an approach is demonstrated by comparing the results obtained with classical LIBS (drawing calibration lines with a series of matrix-matched certified standards) and with independent measurements performed with a conventional technique (LA-ICP-MS).
authors: Department of Chemistry, University of Bari, via Orabona 4, 70126 Bari, Italy; CNR-IMIP, Section of Bari, via Amendola 122/D, 70126 Bari, Italy. Electronic address: rosalba.gaudiuso@ba.imip.cnr.it.
authors: R
authors: R
authors: Gaudiuso
authors: CNR-IMIP, Section of Bari, via Amendola 122/D, 70126 Bari, Italy.
authors: M
authors: M
authors: Dell'Aglio
authors: CNR-IMIP, Section of Bari, via Amendola 122/D, 70126 Bari, Italy.
authors: O
authors: O
authors: De Pascale
authors: Department of Chemistry, University of Bari, via Orabona 4, 70126 Bari, Italy; National Archaeological Museum of Egnatia, Str. Pr. Savelletri, Capitolo, 72015 Fasano (BR), Italy.
authors: S
authors: S
authors: Loperfido
authors: Department of Chemistry, University of Bari, via Orabona 4, 70126 Bari, Italy.
authors: A
authors: A
authors: Mangone
authors: Department of Chemistry, University of Bari, via Orabona 4, 70126 Bari, Italy; CNR-IMIP, Section of Bari, via Amendola 122/D, 70126 Bari, Italy.
authors: A
authors: A
authors: De Giacomo
keywords: Archaeological findings; Calibration-free laser-induced breakdown spectroscopy; Copper-based alloys; Inverse method