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Preparation of High Purity Cesium by Molecular Distillation
Pages: 1466-1469
Year: Issue:  12
Journal: Vacuum Science and Technology

Keyword:  High purity cesiumAtomic clockMolecular distillationPurifying;
Abstract: A novel technique was developed to purify 99. 5% cesium by molecular distillation to meet the stringent requirement of Cesium-Atomic-Clock. The influence of the molecular distillation conditions,including but not limited to the temperature,pressure,rotation speed of the wiper blade and feed-in rate,on the Cs-purification was experimentally investigated. The results show that depending on the purification conditions,most impurities of K and Rb were removed. To be specific,under the optimized conditions: a temperature in 490 510 K range,a wiperblade rotation speed in 180 210 r / min range,and a feed-in rate in 3 5 g / min range,the Cs-purity reached99. 95%,accompanied by the removals of K-impurity from 690 × 10-6 to 106 × 10-6 and Rb-impurity from 840 ×10-6 to 123 × 10-6. We suggest that the molecular distillation may outperform the conventional vacuum distillation because of a lower temperature and a shorter time.
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