Determination of Excitation Transfer rates in an Atmospheric Plasma by Pico-second Laser Excitation and their Application to Plasma Diagnostics

我们研制了脉冲宽度为620ps的激光诱导荧光光谱系统，测量了发光和微空心阴极氦等离子体的荧光强度随时间的变化。我们将测量结果与利用低压下测定的激发传递系数和猝灭速率系数进行的分析进行了比较，发现两者之间存在差异。我们还研制了一台氦原子587多波长高分辨率光谱仪。6667人。8和706。5 nm的发射线，并从观测光谱估算了原子密度、电子密度和温度，最高可达1大气压。

We developed a laser-induced fluorescence spectroscopy system with 620 ps pulse width and measured temporal developments of the fluorescence intensities for glow and micro-hollow cathode helium plasmas. We compared the measured results with the analysis using excitation transfer and quenching rate coefficients determined at low pressures, and found discrepancy between them. We also developed a multi-wavelength high-resolution spectrometer for helium atom 587. 6, 667. 8, and 706. 5 nm emission lines, and estimated the atom density, electron density and temperature from the observed spectra for micro-hollow cathode helium plasmas up to 1 atm.