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Progress on Gas Transmittance Measurement

This article discusses the current state of gas transmittance measurement apparatus, focusing on the initial problems with outgassing of water and oxygen. It explores the absorption coefficient of water vapor and oxygen, and highlights the importance of drying out the sample chamber walls. The transition from an old sample chamber and PMT to a new one is also discussed.

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Progress on Gas Transmittance Measurement

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  1. Progress on Gas Transmittance Measurement Bob Azmoun, SUNY Stony Brook, BNL 2/14/03

  2. Current State of Apparatus

  3. Our Initial Problems with Outgassing [H2O] ~ 100 - 1000 ppm [O2] ~ 50 - 1000 ppm Data Ref.: Zaidel’ & Shreider, VUV Spectroscopy Absorption Coefficient of Water Vapor. Absorption coefficient of Oxygen.

  4. Drying Out the sample chamber walls with Extended Flow Periods and High Flow Rates Old Sample chamber and Old PMT New Sample chamber and New PMT

  5. Final Comments • In order to maintain sufficient transmission efficiency through the gas volume, the container walls must first be adequately degassed, where the water and oxygen concentrations are in the range of a few to 10 ppm.

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