The mechanism of the air afterglow

摘要: Measurements on the NO2 fluorescence [5] give quenching constants a (=kg/ka) of about 30 mm-1 which are hard to reconcile with experiments reported intensity be independent pressure down 1 p [1,4]. Myers, Silver and Kaufman showed that fFr excited by Hg X = 4358 A light decrease increasing wavelength fluorescence. This suggests vibrational relaxation NO,’ is at least as rapid electronic quenching; distribution air afterglow should therefore shift towards blue lower pressures. We have investigated this phenomenon dependence between 10 100 CL using 15 cm diameter flow system [S]. Oxygen atoms were generated in microwave discharge through oxygen alone or an argon carrier mm these gases expanded nozzle into main tube. Nitric oxide diluents added after before nozzle, positions atom concentrations could measured improved nitrogen dioxide titration technique. Fig. shows eq. (i) form