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A Chemical Polishing Technique for KCl
Journal of Applied Physics
Abstract
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: The authors have pursued slip band formation and crack initiation as a function of frequency in titanium (Contimet 30). The specimens were loaded at 0.5, 5 and 50 Hz with a stress amplitude of 20.5 kp/sq mm in a Schenck servohydraulic fatigue testing machine. In an Amsler resonance testing machine the specimens were loaded at a frequency of 90 Hz with stress amplitudes of between 17.5 and 20 kp/sq mm. Results are discussed.
The optical conversion of F centers to M centers in KCl by 1 μ sec light pulses has been studied as a function of repetition rate, temperature, pulse intensity, and F center density. The initial rate of growth after a delay period increases with decreasing repetition rate while the maximum M band yield increases with increasing repetition rate, for both KCl-K. and Co-60 irradiated samples. The results obtained with irradiated crystals follow a kinetics model based on the combination of an anion vacancy with a nearby F' center, in competition with thermal and optical ionization of the F' center. It is proposed that the electronic motion during the delay period and the first stage of M center formation takes place via tunneling, while the later stages of aggregation in which bulk processes control involves the combination of anion vacancies with F centers or M centers. The relationship of this work to steady illumination measurements is discussed.
The production of smooth scratch-free surfaces on the alkali halides KCl and NaCl by means of solvent action is described. It is shown by etching studies that very few dislocations are introduced by this process. Surfaces of the type described are of particular value in the study of the optical absorption of very low loss materials.
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