Premium
Temporal evolution of OH density in a pulse‐modulated surface microdischarge
Author(s) -
Wang Zhiwei,
Feng Chunlei,
Gao Liang,
Ding Hongbin
Publication year - 2020
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.202000122
Subject(s) - dielectric barrier discharge , power density , atomic physics , helium , pulse duration , radical , materials science , plasma , analytical chemistry (journal) , pulse (music) , atmospheric pressure , laser induced fluorescence , chemistry , recombination , dielectric , laser , optics , power (physics) , optoelectronics , physics , thermodynamics , organic chemistry , quantum mechanics , chromatography , detector , meteorology , biochemistry , gene
Laser‐induced fluorescence was used to determine the absolute OH density in a pulse‐modulated atmospheric‐pressure surface microdischarge in helium. Measurements were carried out during the discharge and post‐discharge in both plasma layer and downstream region. Experimental findings show that dissipated power, modulation on‐time duration, and the distance from the dielectric surface have more significant effects on the OH(X) lifetime than OH(X) density. The lifetime dependence on power is more pronounced as compared with the modulation duration. Moreover, a dielectric barrier discharge model was presented to estimate the density evolution and loss mechanisms of OH radicals. The results indicate that the decay of OH density is mainly due to the transport process and recombination reactions.