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Plasma plume emission spectroscopy signals induced in air by 0.8 mJ of a femtosecond-\udSingle Pulse (fs-SP) laser beam were enhanced by using an orthogonal geometry ns-reheating Dual\udPulse (DP) configuration. The plasma plume temperatures of several copper-based-alloy standards\udand calibration curves of their Sn and Pb contents were conveyed. The resulting data showed an\udindependence from the matrix composition so that, even for significant wt % variation of Sn and\udPb, good linear regression coefficients could be obtained (0.99 for Sn and 0.98 for Pb). The DP\udconfiguration, here reported, using a low energy (0.8 mJ) of the fs ablating laser beam, was\udconsidered for determining the Sn and Pb elemental contents of ancient copper-based-alloy artwork\udfragments coming from the “Canne della Battaglia” archaeological site of Minervino Murge\ud(Apulia – South of Italy). The results showed that, even by employing this low energy of the fs\udlaser, which did not cause any visible damage of the ancient samples, the DP configuration\udsupplied large enhancements and very well resolved emission lines of spectra providing\udinformation about the Sn and Pb contents which could support archaeologists work

Femtosecond/Nanosecond dual-pulse orthogonal geometry plasma plume reheating for compositional analysis of ancient copper-based-alloy artworks