Influence of nitrogen oxides NO and NO₂on singlet delta oxygen production in pulsed discharge

Abstract

The influence of nitrogen oxides NO and NO2 on the specific input energy (SIE) and the time behaviour of singlet delta oxygen (SDO) luminescence excited by a pulsed e-beam sustained discharge in oxygen were experimentally and theoretically studied. NO and NO2 addition into oxygen results in a small increase and decrease in the SIE, respectively, the latter being connected with a large energy of electron affinity to NO2. The addition of 0.1–0.3% nitrogen oxides was experimentally and theoretically demonstrated to result in a notable enhancement of the SDO lifetime, which is related to a decrease in the atomic oxygen concentration in afterglow. It was experimentally demonstrated that to get a high SDO concentration at the gas pressure 30–60 Torr for a time interval of less than ∼0.5 s one needs to add not less than 0.2% nitrogen oxides into oxygen. The temperature dependence of the relaxation constant for SDO quenching by unexcited oxygen was estimated by using experimental data on the time behaviour of SDO luminescence.

Experimental and modeling analysis of singlet delta oxygen kinetics in a repetitively pulsed nanosecond discharge

“…Examination of the role of O 2 (a 1 g ) molecules in the high-voltage pulsed discharge being studied requires an understanding of the quenching rates of the species by N 2 , Ar, O 2 , O, O 3 , NO, NO 2 , H 2 , H and HO 2 . A body of literature on these rates exists, particularly in [17,19,21,31]. For example, the total rate of O 2 (a 1 g ) reaction with hydrogen is complicated by the existence of reactive and non-reactive reaction pathways.…”

Interacting kinetics of neutral and ionic species in an atmospheric-pressure helium–oxygen plasma with humid air impurities

“…The presence of humid air, with its significant concentration of nitrogen and water vapour creates reactive nitrogen species which are also of particular interest for the bio-medical community [17][18][19][20][21]. Hydration is significant in humid circumstances resulting in the production of a variety of positive and negative hydrated cluster ions [22][23][24].…”

In-Situ Non-intrusive Diagnostics of Toluene Removal by a Gliding Arc Discharge Using Planar Laser-Induced Fluorescence

“…As higher concentrations of toluene was injected into the dicharge system, more OH radicals were formed through the reactions of toluene molecules with energetic electrons, ions and free radicals. Some possible reaction pathways for toluene decompositon were proposed as follow [19,20,31,32].…”