الفهرس 
Arabic summary
Historical NoteOnly 14 pages are availabe for public view
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Abstract
The structures of bands in solid is still an important problem in physics. Wave mechanical studies of the energy levels showed that much levels of a large number of -closely spaced atoms s would be broadened into bands, which in turn would be periodic in momentum space. If these atoms are periodically arranged in real space, the quantitative calculations of these bands will be quiet difficult. Morever the nature of electronic interactions in solids is more complicated than in atoms or in light diatomic molecules. In many band calculations errors of several electron volts were made in placing energy levels.
The structure of bands can be investigated experimentally from the studies of optical absorption and reflections photo electric studies, peozo reflection, and electron reflection. The present work concerns the studies of band structure of some semiconductor thin films from the optical absorption measurement.