Journal
EUROPEAN PHYSICAL JOURNAL D
Volume 66, Issue 11, Pages -Publisher
SPRINGER
DOI: 10.1140/epjd/e2012-30474-8
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Funding
- China Scholarship Council (CSC)
- Belgian Government through the IAP program [P06/08]
- National Natural Science Foundation of China [10875048, 51077063]
- Research Fund for the Doctoral Program of Higher Education of China [20100142110005]
- Chang Jiang Scholars Program, Ministry of Education, China
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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' = 1, J' = 3). OH(X, v '' = 0, J '' = 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.
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