In situ measurements of krypton in xenon gas with a quadrupole mass spectrometer following a cold-trap at a temporarily reduced pumping speed
In situ measurements of krypton in xenon gas with a quadrupole mass spectrometer following a cold-trap at a temporarily reduced pumping speed
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DOI：
10.1088/1748-0221/8/02/p02011
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发表时间：
2012-12
影响因子：
1.3
通讯作者：
E. Brown;S. Rosendahl;C. Huhmann;C. Weinheimer;Hans Kettling
中科院分区：
文献类型：
--
作者：
E. Brown;S. Rosendahl;C. Huhmann;C. Weinheimer;Hans Kettling
开发了一种使用带有残余气体分析仪的冷阱来测量氙中痕量氪的新方法，该方法通过暂时降低抽速同时消耗最少量的氙来实现更高的灵敏度。通过部分关闭测量室和涡轮分子泵之间的定制蝶阀，可以达到 40 ppt 的灵敏度。该方法已在液化空气公司的内在氪浓度未知的超纯气体样品上进行了测试，得到的氪浓度为 330±200 ppt。
A new method for measuring trace amounts of krypton in xenon using a cold trap with a residual gas analyzer has been developed, which achieves an increased sensitivity by temporarily reducing the pumping speed while expending a minimal amount of xenon. By partially closing a custom built butterfly valve between the measurement chamber and the turbomolecular pump, a sensitivity of 40 ppt has been reached. This method has been tested on an ultra-pure gas sample from Air Liquide with an unknown intrinsic krypton concentration, yielding a krypton concentration of 330±200 ppt.