Measurements of Rotational Temperature and Density of Molecular Nitrogen in Spark-Plug Assisted Atmospheric-Pressure Microwave Discharges by Rotational Raman Scattering

作者：ElSabbagh Mansour^*; Kado Shinichiro; Ikeda Yuji; Sasaki Koichi

来源：Japanese Journal of Applied Physics, 2011, 50(7): 076101.

DOI：10.1143/JJAP.50.076101

Rotational Raman scattering was adopted for measuring the spatiotemporal evolutions of the rotational temperature (T(r)) and the density (n(N2)) of molecular nitrogen at the electronic ground state in spark-plug assisted atmospheric-pressure microwave discharge. The rotational temperature had a spatial distribution with the peak at the plasma center. The temporal evolution of T(r) suggests a long confinement time of heat in this plasma source. Because of the long confinement time of heat, the plasma was in a nonequilibrium state for at least similar to 1 ms after the initiation of the discharge. We observed the depletion of n(N2) as well as the decrease in the partial pressure of N(2) (P(N2)). They were more significant at a longer distance from the plasma center. The depletion of n(N2) at the plasma center was roughly explained by the increase in T(r). On the other hand, we have speculated that the significant decreases in n(N2) and P(N2) in the peripheral region of the plasma is owing to dissociation of N(2) followed by nitriding of solid surfaces.

• 出版日期2011-7