Determination of molecular nitrogen by electron-impact induced fluorescence.
When a sample of nitrogen gas is bombarded by 100-eV electrons, fluorescent emission from the nitrogen molecular ion, N(+)(2), is observed. The intensity of this fluorescence can be related to the pressure (or molar concentration) of the parent molecule, N(2). The limit of detection for N(2) by means of electron-impact induced fluorescence is 5.0 x 10(-8)mmHg (1.6 x 10(9) molecules/cm(3) or 2.7 x 10(-12) mole/l.). The fluorescence signal is linearly related to N(2) pressure over a range of four orders of magnitude, and relative standard deviations of less than 2% are observed for replicate measurements.
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Department of Chemistry, University of Tennessee, Knoxville, TN 37996, U.S.A.
Wehry
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