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The concentration of F centers in additively colored KCl was determined by measuring the amount of hydrogen evolved when the colored crystal is dissolved in water. This method avoids the uncertainties inherent in previous experiments on the change in acidity occurring upon dissolution. The use of this concentration in the Smakula absorption equation gives the optical oscillator strength f. The value of f, based upon 12 independent experiments, was 1.17±0.15, which disagrees with previously reported values.
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Scott et al. (1958) studied this question.
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