Lifetimes of electronically excited NO2 in a collision-free differentially pumped supersonic molecular beam

The lifetimes of rotationally cooled NO₂ were measured in the spectral region 5710–5960 Å in a differentially pumped collision- free supersonic molecular beam. Lifetime values (rotationally independent) between 25 and 260 μs were obtained. Over narrow spectral regions, the product of the fluorescence amplitude and the lifetime squared is vibrationally independent, as predicted by theory.