Modeling of glow discharge optical emission spectrometry: Calculation of the argon atomic optical emission spectrum
Modeling of glow discharge optical emission spectrometry: Calculation of the argon atomic optical emission spectrum
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辉光放电发射光谱分析的建模：氩原子发射光谱的计算
DOI：
10.1016/s0584-8547(98)00139-6
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Vlček
中科院分区：
文献类型：
--
作者：
A. Bogaerts;R. Gijbels;J. Vlček
本文用最近发展起来的氩原子碰撞辐射模型计算了辉光放电中氩原子谱线的光发射谱。Bogaerts等人，氩辉光放电的碰撞辐射模型，应用物理学杂志，第84卷，第1期，1998）。结果表明，对应于4p → 4s跃迁的谱线明显占主导地位。然而，它们并不负责辉光放电中的特征可见光，因为它们位于700和1000 nm之间，主要是在近红外。辉光放电的特征蓝光是由对应于5p → 4s跃迁的谱线（位于光谱的蓝紫部分）引起的。除了这两个最重要的线组（所谓的“红”线和“蓝”线），还有大量的其他谱线，使得整个氩光谱相当复杂。计算的光谱与文献中的实验光谱进行了比较，并获得了良好的定性协议。计算出的源自低激发能级（即，4p，3d，5s，5p，4d，6s）在阴极辉光中显示出最大值，该最大值由快速氩离子和原子碰撞激发引起，达到这些水平，并且在负辉光开始时显示出第二最大值，该第二最大值由电子碰撞激发引起。在阴极辉光的最大值是非常明显的线起源于4p的水平，这是与实验观察。较高的激发能级不被快速氩离子和原子碰撞激发占据，而仅被电子碰撞激发占据;因此，源自这些能级的线仅在负辉光开始时呈现最大值。
The optical emission spectrum of the argon atomic lines in a glow discharge is calculated, using a collisional–radiative model for argon, which was recently developed (A. Bogaerts et al., Collisional–radiative model for an argon glow discharge, J. Appl. Phys., vol. 84, No 1, 1998). It is shown that the lines corresponding to 4p→4s transitions clearly dominate the spectrum. They are, however, not responsible for the characteristic visible light in the glow discharge, because they are lying between 700 and 1000nm, which is mainly in the near infrared. The characteristic blue light of the glow discharge is caused by the lines corresponding to 5p→4s transitions (lying in the blue–violet part of the spectrum). Beside these two most important line groups (the so-called `red' and `blue' lines) a large number of other lines are present, making the entire argon spectrum quite complex. The calculated spectrum is compared with experimental spectra from the literature, and excellent qualitative agreement is obtained. The calculated spatial distributions of optical emission lines originating from low excited levels (i.e., 4p, 3d, 5s, 5p, 4d, 6s) show a maximum in the cathode glow, caused by fast argon ion and atom impact excitation, to these levels, and a second maximum in the beginning of the negative glow, due to electron impact excitation. The maximum in the cathode glow is very pronounced for lines originating from the 4p levels, which is in agreement with experimental observations. The higher excited levels are not populated by fast argon ion and atom impact excitation but only by electron impact excitation; hence, lines originating from these levels exhibit only a maximum in the beginning of the negative glow.