Investigation of atmospheric pressure air plasma by two-photon laser induced fluorescence

摘要

We have applied two-photon absorption laser-induced fluorescence (TALIF) to investigate Nanosecond Repetitively Pulsed Discharges (NRPD) in air at atmospheric pressure, in a pin-to-pin electrode configuration. TALIF measurements have been performed to characterize the formation of atomic oxygen after the discharge pulse. Atomic oxygen is one of the key species in combustion processes and understanding its formation is important to understand the mechanism of plasma-assisted flame ignition and stabilization. Kinetic models suggest that oxygen is produced via the dissociative quenching of molecular oxygen by the electronically excited nitrogen produced by the pulses. In this paper we present measurements of atomic oxygen that support the proposed mechanism.