Snyder SC, Crawford DM, Fincke JR
Idaho National Engineering and Environmental Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415, USA.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 2000 Feb;61(2):1920-4. doi: 10.1103/physreve.61.1920.
Electron temperature and electron density measurements were made in an atmospheric-pressure argon plasma jet by line-shape analysis of Thomson-scattered laser light. The dependence of electron temperature and electron density on the scattering angle was investigated. Measurements were made using incident laser wavelengths of 532 and 355 nm. At 532 nm, the electron-ion collision frequency exceeds the Landau damping rate for shallow scattering angles, and the electron plasma wave resonance structure in the Thomson line shape is broadened. This resulted in dramatic increase in the apparent electron temperature as a function of decreasing scattering angle. At 355 nm, collisions do not affect the Thomson line shape. In this case, an angular dependence of the measured electron temperature is not expected and was not observed. Data taken at 532 nm at larger scattering angles are consistent with the 355-nm results, and show that the electrons are not in thermodynamic equilibrium with the heavy particles.
通过对汤姆逊散射激光的线形分析，在大气压氩等离子体射流中进行了电子温度和电子密度测量。研究了电子温度和电子密度对散射角的依赖性。使用532和355nm的入射激光波长进行测量。在532nm处，对于浅散射角，电子 - 离子碰撞频率超过朗道阻尼率，并且汤姆逊线形中的电子等离子体波共振结构变宽。这导致表观电子温度随散射角减小而急剧增加。在355nm处，碰撞不影响汤姆逊线形。在这种情况下，预计并且未观察到测量的电子温度的角度依赖性。在较大散射角下于532nm处获取的数据与355nm的结果一致，表明电子与重粒子不处于热平衡状态。
