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Airbeam correction in a varying-N 2 atmosphere

Airbeam correction in a varying-N 2 atmosphere. Christine Loza 26 March 2012 AMS user meeting. Background. Chamber experiment Begin with air Flush the bag with Ar until Ar is about 10% Run an experiment After 18 h begin flushing with air. If we had mass balance….

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Airbeam correction in a varying-N 2 atmosphere

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  1. Airbeam correction in a varying-N2 atmosphere Christine Loza 26 March 2012 AMS user meeting

  2. Background • Chamber experiment • Begin with air • Flush the bag with Ar until Ar is about 10% • Run an experiment • After 18 h begin flushing with air

  3. If we had mass balance… • Assume air in the chamber is ideal • 2 sinks of N2: filament and dilution • molAr+molN2+molO2 = const. (from ref. period) • molO2/molN2 = 0.268 (ratio for air) • molAr/molN2 = rArN2 (measured) • Substitute into mass balance eqn. to eliminate Ar and O2, and predict the amount of N2 expected with dilution • N2,pred = const./(rArN2+1.268) • We could compare this with the observed N2 to determine the effect of the filament

  4. Look at the N2, O2, Ar ions (HR; V-mode) Start air Start Ar

  5. Look at the N2, O2, Ar ions (HR; W-mode) Start air Start Ar

  6. Diagnostics

  7. Chamber temperature (measured by a Vaisala probe) Lights on Not connected to chamber Ar injection But, as T increases, n/V decreases.

  8. Comments about the air signals • O2/N2 varies by about 5% throughout the experiment (0.208±0.001 V; 0.199±0.003 W) regardless of how much Ar is added • Normal air: 78.084% N2, 20.946% O2, 0.934% Ar • Ratio of O2/N2 for normal air is 0.268. • Is there a reason why the AMS is low? • Another problem: N2+O2+Ar is not constant (or always decreasing) • Maybe these are linked? • Is there another sink of N2?

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