Abstract
Atmospheric pressure non-equilibrium plasma jets (APNP-Js) generate plasmas in open space rather than in confined discharge gaps and are promising for applications in materials processing, nanotechnology, and plasma medicine. High-speed photographs have shown that the plasma plumes are in fact composed of bullet-like plasma volumes travelling at speeds of 104-105 m/s. It is now generally agreed that the plasma bullets are similar to cathode-directed streamers1. For the propagation of cathode-directed streamers, free electrons ahead of the streamer front are needed; Photo-ionization is one of the key mechanisms to produce these free electrons. The existing theoretical models suggest possible critical roles of the local electric field induced by space charges, as well as photo-ionization and residual electron effects. However, we are not aware of experimental reports on the effect of photo-ionization on the plasma bullet propagation.
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