STUDIES OF LIFETIMES OF ROTATIONALLY COOLED NO2 USING TIME-RESOLVED FLUORESCENCE EXCITATION-SPECTRA

A taunble, pulsed dye laser with output in the region of 5750 to 6000 Å was used to excite rotationally cooled NO2 which was produced by expansion in conjunction with argon carrier gas through a supersonic nozzle. The resulting time-resolved fluorescence excitation spectra were used the lifetimes of various vibronic bands of NO2 (2B2). The lifetimes measured were in the region of 15 to 40 μs which were shorter than those obtained from cell experiments. For each individual excitation wavelength, only a single exponential decay was observed from very early times through 250 μs. © 1979.