Indexed by:
Journal Papers
First Author:
Wang, Yong
Correspondence Author:
Ding, HB (reprint author), Dalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Chinese Minist Educ, Sch Phys, Dalian 116024, Peoples R China.
Co-author:
Shi, Jielin,Li, Cong,Feng, Chunlei,Ding, Hongbin
Date of Publication:
2019-12-01
Journal:
AIP ADVANCES
Included Journals:
SCIE
Document Type:
J
Volume:
9
Issue:
12
Abstract:
The expanding cascaded arc Ar/N-2 plasma has been investigated by both the active and passive optical diagnostic technologies. In the investigation, the laser Thomson scattering (LTS) and optical emission spectroscopy (OES) have been adopted to measure electron temperature (T-e) and electron excitation temperature (T-exc), respectively. The LTS measurements show that a remarkable nonlinear behavior of T-e as a function of the N-2/(Ar + N-2) ratio is found, which is caused by the collective interaction between the superelastic collision and the electron-impact excitation. The superelastic collisions by the highly excited vibrational nitrogen molecules can effectively heat the free electrons, while the electron kinetic energy can be transferred to N-2 molecular internal energy via the electron impact with N-2 in the ground state. The difference between T-exc and T-e demonstrates that the cascaded arc Ar/N-2 plasma significantly deviates from the local thermodynamic equilibrium. This would be useful for improving our further understanding of nonequilibrium plasma and extending applications of the cascaded arc Ar/N-2 plasma.
Translation or Not:
no
