A simple high-sensitivity technique for purity analysis of xenon gas

Details A simple high-sensitivity technique for purity analysis of xenon gas A simple high-sensitivity technique for purity analysis of xenon gas

2010-02-14

arxiv.org/abs/1002.2742v2

Physics

Instrumentation and Detectors

20 pages, 5 figures

Scientific paper

10.1016/j.nima.2010.04.152

We report on the development and performance of a high-sensitivity purity-analysis technique for gaseous xenon. The gas is sampled at macroscopic pressure from the system of interest using a UHV leak valve. The xenon present in the sample is removed with a liquid-nitrogen cold trap, and the remaining impurities are observed with a standard vacuum mass-spectroscopy device. Using calibrated samples of xenon gas spiked with known levels of impurities, we find that the minimum detectable levels of N2, O2, and methane are 1 ppb, 160 ppt, and 60 ppt respectively. This represents an improvement of about a factor of 10,000 compared to measurements performed without a coldtrap.

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