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

我们开发了脉冲宽度为620 ps的激光诱导荧光光谱系统，并测量了辉光和微型空心阴极氦等离子体荧光强度的时间变化。我们将测量结果与低压下的激励传递和淬火速率系数分析结果进行了比较，发现两者之间存在差异。我们还研制了氦原子587多波长高分辨率光谱仪。6、667。8和706。5nm发射谱线，并从观测到的1atm以下的微型空心阴极氦等离子体光谱中估计出原子密度、电子密度和温度。

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.