الفهرس 
الملخص العربى
An introduction to the physica:,l propertiee of crystalsOnly 14 pages are availabe for public view
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Abstract
The existence of colored specimens of normally colorless minerals has been known for much longer than a century and has excited the curiosity of mineralogists, chemists and physicists.(1,2,3) The crystals may be colored due to centers formed by trapping of electrons and holes as lattice defects forming the so called color centers It seems wise to provide a rather utilitarian shorthand of the field which is required for treatment of F center as well as the effect of heat treatment and quenching on this center, strictly, concerning single crystals of sodium chloride
Attention is focused essentially on the properties and parameters pertinent to the problem under consideration and dominating the whole pictures, Thereafter we proceed to incorporate these parameters in the concepts of the field theory.