LIBS methodology for analysis of ancient
artworks made of copper-based alloys*
O. De Pascale1, A. De Giacomo2, M. Dell’Aglio1,
R. Gaudiuso1, A. Santagata3, 1G.S. Senesi
1CNR-IMIP
2Università
3CNR-IMIP
Bari, Via Amendola 122/D, 70126 Bari, Italy
degli Studi di Bari, Dip. Chimica, Via Orabona 4, 70126 Bari, Italy
Potenza, Zona Industriale di Tito Scalo, 85050 Tito Scalo (PZ), Italy
*Thanks are due to “Soprintendenza ai Beni Archeologici della Puglia” for the ancient bronze
samples, from a necropolis (VII century b.C.) in Minervino Murge (Bari-Italy) .
Experimental set-up
PLASMA
laser
LIBS technique is based on
Sample
the optical emission
spectroscopy of the plasma
monochromator
produced by the laser pulse
irradiation of the sample.
ICCD
optical
fiber
Although the experimental set-up is
3120
2,2E4
2,1E4
1,95E4
1,8E4
1,65E4
1,5E4
1,35E4
1,2E4
1,05E4
9E3
7,5E3
6E3
4,5E3
3E3
1,5E3
0
Z-axis (m)
2600
2080
1560
1040
Intensity (a.u.)
520
experiments are required to select the
optimal detection time (delay from the
laser pulse and gate width) and the
Sn I
20000
15000
10000
5000
really simple and flexible, preliminary
Cu I
Cu II
276
Pb I
Sn I
278
280
Sn I
282
element spectral lines (avoiding self
Sn I
Cu I
Mn I
Pb I
284
Sn I
286
Wavelength (nm)
Sb I Cu II
Si I
Pb I
288
absorption) for the quantitative analysis.
290
292
C
E
D
A
B
(w%) 15%
Sn
Pb
Zn
Fe
Ni
Sb
Si
As
Mg
Cu
A (Belt)
17.8
3.7
n
n.d.
n.d.
n.d.
1.40
n
y
balance
B (Bacin)
7.63
0.17
n
0.07
0.47
0.28
0.03
n
y
balance
C (Fibula)
27.7(>30)
4.27
n
0.16
0.23
0.04
0.64
n
y
balance
D (Helm)
16.8
0.60
n.d.
n.d.
n.d.
0.42
0.3
n
y
balance
38.9(>40)
26.7(>25)
0.94
0.26
1.56
0.21
3.09
n
y
balance
E (Pendant)
RESULTS