Contains a summary of research.Joint Services Electronics Program (Contract DAAB07-76-C-1400

Kastner, Marc A.

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XVIII. ELECTRONIC PROPERTIES OF CHARGED CENTERSIN SiOZ-LIKE GLASSESAcademic Research StaffProf. Marc KastnerGraduate StudentsCaroline GeeJoseph W. OrensteinJoint Services Electronics Program (Contract DAAB07-76-C- 1400)Marc KastnerA vacuum-ultraviolet optical system has been constructed to examine photolumines-cence from SiO2 . The system consists of a McPherson 218 vacuum monochromator, aMcPherson Hinteregger hydrogen discharge lamp, and a high-vacuum optical system.The cost of this system (about $25,000) was furnished almost entirely by a CottrellGrantfrom Research Corporation and M. I. T. funds.A major modification of the lamp was necessary to provide stable continuous opera-tion. This has now been completed. An improvement over previous designs allows quitelong periods of stable operation.The first measurements on Supersil fused quartz indicate that luminescence can beexcited by photons with energies near the band gap even at room temperature. Manyother measurements are needed to ascertain whether this photoluminescence is, as wepredicted, similar to that observed at valence-alternation defects in chalcogenideglasses.The next stage in our program is to measure the temperature dependence of theluminescence. For this a liquid He temperature cold finger must be added to our opti-cal system. We have, so far, measured only the excitation spectrum of the lumines-cence. Modifications of the optical system will be made to measure the luminescencespectrum as well.PR No. 120

Electronic Properties of Charged Centers in SiO₂-like Glasses

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Electronic Properties of Charged Centers in SiO₂-like Glasses

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