Abstract
A non-equilibrium atmospheric pressure plasma jet excited by 60-Hz ac power was diagnosed by laser Thomson and laser Raman scattering. We obtained the spatial distributions of the electron density, electron temperature, and gas temperature. The results show that the plasma can generate an electron density of up to 1021 m-3, an electron temperature of approximately 1 eV, and a gas temperature as low as approximately 700 K, indicating that the plasma is in the non-equilibrium state. The laser scattering diagnostic method and the obtained data are useful in the application of the non-equilibrium atmospheric pressure plasma jet.