The accurate detection of reactive nitrogen species (NO
y) is key to understanding tropospheric ozone production. Typically, NO
y is detected by thermal conversion to NO
2, followed by NO
2 detection. Here, we assess the conversion efficiency of several NO
y species to NO
2 in a thermal dissociation cavity ring-down spectrometer and discuss how this conversion efficiency is affected by certain experimental conditions, such as oven residence time, and interferences from non-NO
y species.
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