Singlet Oxygen Generation in DC Glow Discharge

On the influence of electronically excited oxygen molecules on combustion of hydrogen–oxygen mixture

“…The method of delivering a sufficient amount of O 2 (a 1 g ) and O 2 (b 1 + g ) molecules into the oxygen flow is an important point for the accomplishment of such an experiment. Numerous studies have been devoted to this problem in recent years [14][15][16][17][18]. This interest was stimulated mainly by the development of an oxygen-iodine laser, efficiently pumped due to electronic-electronic collisional energy transfer from a O 2 (a 1 g ) molecule to an iodine atom.…”

“…At low pressures P = 5-20 Torr, singlet oxygen molecules may be generated by means of a direct current (dc) glow discharge in the O 2 flow. This type of discharge in O 2 is known to produce a significant amount ( 10%) of O 2 (a 1 g ) molecules [14][15][16]. It is worth noting that in order to provide the maximal yield of singlet oxygen molecules in pure oxygen electric discharge the value of the reduced electric field, E/N, should be held close to 1.1 × 10 −16 V cm 2 [17,18] (see figure 1).…”

“…However, in a glow discharge the values of E/N are noticeably larger, namely (6-9) × 10 −16 V cm 2 . At such high values of the reduced electric field, besides O 2 (a 1 g ) and O 2 (b 1 + g ) molecules, the oxygen plasma should also contain a significant number of oxygen atoms (1-4%) [14,15]. On the one hand, atomic oxygen is a highly reactive component participating in the chain-branching reactions.…”