Measurement of hydroxyl radicals in pulsed corona discharge

Hydroxyl radical generated by a pulsed corona discharge was measured by laser-induced predissociative fluorescence (LIPF) with a tunable KrF excimer laser. The LIPF with a KrF laser is a suitable method for OH observation at atmospheric pressure. It can drastically reduce the influence of undesirable quenching in the excited state. It was demonstrated that the OH–LIPF could be applied to pulsed corona discharge at atmospheric pressure. OH was observed with the LIPF in H2O/O2/N2 mixture. The dependence of OH yield on ambient gas composition and discharge voltage was studied. In addition, the reaction of OH with NO, a pollutant removed by non-thermal plasma, was monitored by the LIPF. Our research showed that the LIPF with a KrF laser is a useful tool for characterizing OH radicals in pulsed corona discharge.