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Measurements of the Absolute Absorbance/Transmittance of Ar using a Gas Flow System

Measurements of the Absolute Absorbance/Transmittance of Ar using a Gas Flow System. Bob Azmoun; SUNY Stonybrook, BNL 1/22/03. Sample chamber passed a He leak check. Increasing pressure is the result of out-gassing. Out-gassing substance unknown. Gas flow system is necessary.

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Measurements of the Absolute Absorbance/Transmittance of Ar using a Gas Flow System

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  1. Measurements of the Absolute Absorbance/Transmittance of Ar using a Gas Flow System Bob Azmoun; SUNY Stonybrook, BNL 1/22/03

  2. Sample chamber passed a He leak check. • Increasing pressure is the result of out-gassing. • Out-gassing substance unknown. • Gas flow system is necessary. Absorbance Vs. Pressure Schematic of VUV apparatus Absorbance/Transmit-tance measured with respect to vacuum.

  3. Simple Gas Flow System Schematic of simple gas flow system. • The transmittance through a static volume of gas shows rapid decline as a function of time. • The transmittance improves with increasing flow time. • The level of out-gassing/contamination is unknown using this set-up.

  4. More Sophisticated Gas Flow System Schematic ofmore sophisticated gas flow system. • New gas system doesn’t show improvements in gas purity over simpler system (yet). • New system provides concentration levels of O2 and H2O. • After by-passing the sample chamber in the gas flow circuit, the concentrations of O2 and H20 dropped to: [O2]=7.4ppm; [H2O]=35.0ppm.

  5. Data Identifying the Out-gassing substances. Ref.: Zaidel’ & Shreider, VUV Spectroscopy Absorption Coefficient of Water Vapor. Absorption coefficient of Oxygen.

  6. Final Remarks • If indeed water vapor is the primary contaminant as the data suggests, then the gas purity may be dramatically improved by both baking out the sample chamber first and allowing for a longer flow period.

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