We report x ray photoemission spectroscopy (XPS) and scanning Auger microscopy (SAM) studies of a Roman lead pipe 'fistula' and a Roman bronze sample. SAM analysis shows that the lead is much more oxidized in the original patina than in the naked surface of the fistula. Comparisons performed between large-area XPS measurements and microscopic SAM measurements indicate that there is a huge lateral chemical inhomogeneity in the surface composition of the bronze. Auger point spectra and elemental Auger imaging reveal, with a sub-micron spatial resolution, that tin is exclusively associated with oxygen in both materials, and the lateral distribution of these two elements is complementary to that of chlorine.
Surface and interface microchemistry of archaeological objects studied with x ray photoemission spectroscopy and scanning Auger microscopy
Paparazzo E;
1995
Abstract
We report x ray photoemission spectroscopy (XPS) and scanning Auger microscopy (SAM) studies of a Roman lead pipe 'fistula' and a Roman bronze sample. SAM analysis shows that the lead is much more oxidized in the original patina than in the naked surface of the fistula. Comparisons performed between large-area XPS measurements and microscopic SAM measurements indicate that there is a huge lateral chemical inhomogeneity in the surface composition of the bronze. Auger point spectra and elemental Auger imaging reveal, with a sub-micron spatial resolution, that tin is exclusively associated with oxygen in both materials, and the lateral distribution of these two elements is complementary to that of chlorine.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
