Notes 329 experiment evolved 10.06 cm.3 of gas which consisted of equal volumes of krypton and fluorine. Thus, the product was also KrF2.Both krypton tetrafluoride and krypton difluoride are known to be unstable at room temperature. Therefore, under the conditions of our experiments only those portions of krypton difluoride formed which got into the cooled extension tube of the flask were entrapped (quenched) and remained undecomposed. The amount of the KrF2 produced depends, therefore, not only upon the amount of radiation energy absorbed but, to a very large extent, upon the effectiveness of cooling.In the experiments with Kr-F2 mixtures the total amount of KrF2 formed in a 2-1. flask during 5 weeks of standing varied from 70 to 100 mg.; i.e., the average rate of production was 2-3 mg. of KrF2 per day.In the experiments with Kr-OF2 mixtures the rate of formation was about 1 mg. of KrF2 per day.The yield of KrF2 may probably be increased by use of a wider tubular extension of the flask and by lowering the cooling temperature (to the boiling point of krypton, 120°K.).
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