Time-resolved imaging of 'Plasma Bullets' in a dielectric capillary atmospheric pressure discharge

摘要

Temporally resolved images acquired using a 5-ns gated intensified charge-coupled device camera show the dynamical behavior of a plasma jet emanating from the end of a dielectric capillary operating at atmospheric pressure. Broadband emission and filtered emission from excited Ar, He, $ hbox{N}_{2}$ and $hbox{N}_{2}^{+}$ species were acquired. The properties of the highly localized so-called "plasma bullets" that make up the plasma jet strongly resemble the properties of cathode-directed streamers in positive corona discharges.