The production mechanisms of OH radicals in a pulsed direct current plasma jet

• DOI: 10.1063/1.4895496
• Publication Date: 2014-09-30T00:30:54Z
• Authors: X. Y. Liu; X. K. Pei; K. Ostrikov; X. P. Lu; D. W. Liu
• Keywords: Penning ionization

The production mechanism of OH radicals in a pulsed DC plasma jet is studied by two-dimensional (2-D) model and one-dimensional (1-D) discharge model. For the open air, electron-impact dissociation H2O, electron neutralization H2O+, as well H2O O(1D) are found to be main reactions generate species. contribution more than others. additions N2, O2, into working gas increase density outside tube slightly, which attributed electrons produced Penning ionization. On other hand, O2 inside substantially, increased O (1D) concentration, respectively. flow will transport high out during pulse off period. It also shown that chemistry reactivity can effectively controlled numbers. These results supported laser induced fluorescence measurements relevant several applications atmospheric-pressure plasmas health care, medicine, materials processing.