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Аннотация The influence of the presence of between 1% and 6% ofCu in arsenic chalcogenide glasses is examined through a study of the electronic energy levels by means of X-ray photoelectron and X-ray emission spectroscopy, through an investigation of the low-energy tunneling systems by means of phonon echoes at 0.37 K, and through an examination of the photodarkening and the photoinduced dichroism caused by polarezed Ar+-laser irradiation. Possible links between the various effects are being looked for. The Cu atoms do become an integral part of the amorphous lattice structure and strongly influence the photodarkening, but they do not have a significant effect on the tunneling systems or the dichroism. It is concluded that the tunneling levels and the dichroism involve only local configurations, while the photodarkening involves larger-scale areas of the lattice.