| Popis: |
Radiative emission in the NO γ-band system occurs when air at a few Torr initial pressure is shock-heated at sufficiently high temperatures of 3500–7000 K. Emission spectra of this system in shocks indicate that collisional quenching of the emitting A 2Σ+ state is a critical quantity controlling the intensity. Quenching of excited NO by NO itself has been measured using direct time decay of laser-induced fluorescence in the shock tube at 3500 K. The cross section (2−σ error) is 59±20 A2, compared to the room temperature value 37±8 A2. At 3500 K, N2 also quenches NO with a cross section ∼2 A2, much larger than the value at 300 K. |
