Investigation of the structure of chalcogenide glasses

In the frame of this work a group of chalcogenic glasses, arsenic and germa nium sulfides and selenides were investigated. The structures and vibration al spectra of the unit elements of these materials, the so-called clusters, were calculated with quantum chemical methods. The yielded data were compa red with the experimental spectra. It was established in this way which clu ters exist really in these materials. The resulted data were analyzed with the tools of normal coordinate analysis and spectrum simulation. The sulfid es and the selenides and from another point of view the arsenic and the ger manium glasses were compared.