Free Radical Observations and Chemical Kinetics in the Atmosphere

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Free Radical Observations and Chemical Kinetics
in the Atmosphere
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Detection of NO2 by Laser-induced Fluorescence
Cooled PMT
2B2
NO2
Filters to block laser scatter
White Cell
585 nm
To Pump
lgt700 nm imaged on to PMT
Sample Inlet
2A1
Etalon
Power Monitor
Io
NdYAG
NO2 Reference
I
585 nm
Tunable Dye Laser
532 nm
We use light of 585 nm to excite NO2 to a narrow
rovibronic feature. Red-shifted fluorescence is
imaged onto a cooled PMT. We have demonstrated a
detection limit of 20 ppt with 20 second
averaging.
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UC Blodgett Forest August 16-29, 1998
Julian Day
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Most important parts of NOx/NOy photochemistry
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4989 observations
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