Absolute OH density determination by laser induced fluorescence spectroscopy in an atmospheric pressure RF plasma jet

作者：Xiong Q^*; Nikiforov A Yu; Li L; Vanraes P; Britun N; Snyders R; Lu X P; Leys C

来源：European Physical Journal D, 2012, 66(11): 281.

DOI：10.1140/epjd/e2012-30474-8

In this paper, the ground state OH density is measured in high pressure plasma by laser-induced fluorescence (LIF) spectroscopy. The OH density determination is based on the simulation of the intensity fraction of fluorescence from the laser-excited level of OH(A) in the total detected LIF signal. The validity of this approach is verified in an atmospheric pressure Ar + H2O plasma jet sustained by a 13.56 MHz power supply. The transition line P-1(4) from OH(A, v%26apos; = 1, J%26apos; = 3). OH(X, v %26apos;%26apos; = 0, J %26apos;%26apos; = 4) is used for the LIF excitation. The absolute OH density is determined to be 2.5 x 10(19) m(-3) at 1 mm away from the jet nozzle. It corresponds to a dissociation of 0.06% of the water vapor in the working gas. Different mechanisms of OH(X) production in the core of the plasma jet are discussed and analyzed.

• 出版日期2012-11
• 单位华中科技大学