Exposition of the results of an investigation into the photochemical conversion of F-centers in KCl crystals at temperatures 270-300C, which leads to the complete disappearance of the F-band of absorption and to its substitution by a very similar new symmetric bell-shaped band (X-band) displaced about 0.5 ev toward the long-wavelength side. For lower temperatures (250-150C) the light action also leads to complete disruption of the F-band with its substitution by ...
The Universal Stage is an accessory for a polarizing microscope useful in the determination of optical properties of organic and inorganic compounds. Detailed instructions are given for the mounting of crystals, centering the stage, etc. Specialized techniques are given in step-by- step procedures for the orientation of uniaxial and biaxial crystals, the identification of the orientation of uniaxial and biaxial crystals, the identification of the orientation achieved, the mathematical corrections ...
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