Semiconductor laser-based measurements of quench rates in an atmospheric pressure plasma by using saturated-fluorescence spectroscopy.
Semiconductor laser-based measurements of quench rates in an atmospheric pressure plasma by using saturated-fluorescence spectroscopy.
复制标题
使用饱和荧光光谱法基于半导体激光测量大气压等离子体中的淬灭速率。
DOI：
10.1364/ao.32.000948
复制
发表时间：
1993
期刊：
影响因子：
1.9
通讯作者：
R. Hanson
中科院分区：
文献类型：
--
作者：
D. Baer;R. Hanson
等离子体诊断的基础上饱和荧光和吸收光谱与半导体（二极管）激光探测4s（3）P（1）？4p（3）D（2）转变（8425 A）的氩气在大气压等离子体中的感应耦合等离子体炬产生的。饱和强度，非辐射碰撞转移（淬火）率，和荧光产率（斯特恩-沃尔默因子）的空间分辨测量推断从光谱轮廓特征（线形状，线中心值，和频率积分信号）与激光强度的变化。在感应线圈上方10 mm的分析区域内，荧光光谱和吸收光谱的结果是一致的。测得的淬火率比较有利的计算速率从一个多级碰撞辐射模型，假设一个超热电子人口相对于当地的热力学平衡值在动力学温度。
Plasma diagnostics based on saturated fluorescence and absorption spectroscopy with a semiconductor (diode) laser are developed to probe the 4s(3)P(1) ? 4p(3)D(2) transition (8425 A) of argon in an atmospheric pressure plasma produced by an inductively coupled plasma torch. Spatially resolved measurements of saturation intensity, nonradiative collisional transfer (quench) rate, and fluorescence yield (Stern-Volmer factor) are inferred from variations of spectral profile characteristics (line shape, line-center value, and frequency-integrated signal) with laser intensity. The results obtained by using fluorescence and absorption spectroscopy are mutually consistent in the analytical region 10 mm above the induction coil. The measured quench rates compare favorably with computed rates from a multilevel collisional radiative model that assumes a suprathermal electron population relative to the local thermodynamic equilibrium value at the kinetic temperature.