<title>Vibrational and structural properties of unmodified and radiation-modified chalcogenide glasses for advanced optical applications</title>

Abstract

ABSTRACT Vibrational and structu ral properties of Ge x Sb 40  x S 60 (x = 25, 27, 35) chalcogeide glasse s are studied in unmodified and J-radiation-modified states by using infr ared spectroscopy, high-energy synchrotr on x-ray diffraction and extended x-ray absorption fine structure spectroscopy. An agreement between radiation-induced structural changes and vibrational properties measured is established. It is suggested that the atomic pairs with wrong coordination created in the framework of coordination topological def ect formation concept play a key role in the formation of radiation-modified state of the investigated glasses. Advantages and disadvantages of post-technological radiation-modification of chalcogenide glasses are considered within configuration co ordinate model for description of unmodified and radiation-modified states. Keywords: Chalcogenide glasses, infrared spectroscopy, high-energy synchrotron x-ray diffraction, extended x-ray absorption fine structure spect roscopy, radiation modification