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X-ray photoelectron spectroscopy measurements have been performed on n-type Bi-modified Ge 20 S 64 Bi 16 glass. The observed chemical shifts show that Bi is incorporated as a positive charged center into the matrix of Ge 20 S 80 parent glass.
Laboratoire d'Etude et de Caracterisation des Amorphes et des Polymeres, Faculte des Science, Universite de Rouen, 76821 Mont Saint Aignan Cedex, France