He(43P) sublevel quenching by electron collision
He(43P) sublevel quenching by electron collision
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He(43P)电子碰撞亚能级猝灭
DOI：
10.1088/0953-4075/28/2/010
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
S. Benedictis
中科院分区：
文献类型：
--
作者：
G. Dilecce;P. Ambrico;S. Benedictis
用激光共振荧光方法研究了He（43 P）子能级的电子碰撞猝灭。用调谐到23 S-43 P跃迁的染料激光器对该次能级进行光泵浦，观察和分析了43 P本身和43 D态的荧光。测量是在不同的时间在一个脉冲RF放电后放电，它是相关的电子随机通量的衰减。后者是同时测量的时间分辨朗缪尔探针技术。结合这两个结果可以测量电子碰撞速率常数kel（43 P）=（1.23+或-0.34）*10- 4cm ~ 3·s ~（-1），对于43 P的完全猝灭，和kel（43 P到44 D）=（1+或-0.24）*10- 4cm ~ 3·s ~（-1）。这样的速率常数原来是恒定的，在实验精度范围内，在0.2-0.6 eV的电子平均能量。与理论计算结果吻合较好。电子碰撞的重要性也证明了从53 D，41 D状态的荧光的定性分析。
The quenching by electron collisions of the He(43P) sublevel has been studied by a laser resonance fluorescence method. The sublevel is optically pumped by a dye laser tuned to the transition 23S-43P, and the fluorescence from 43P itself and from the 43D state is observed and analysed. The measurement is performed at various times in the post discharge of a pulsed RF discharge, and it is correlated to the decay of the electron random flux. The latter is measured simultaneously by a time resolved Langmuir probe technique. Combination of the two results allows the measurement of the electron collision rate constants kel(43P)=(1.23+or-0.34)*10-4 cm3 s-1, for the total quenching of 43P, and kel(43P to 44D)=(1+or-0.24)*10-4 cm3 s-1. Such rate constants turn out to be constant, within the experimental accuracy, in the range 0.2-0.6 eV of electron average energy. A good agreement is obtained with theoretical calculations. The importance of electron collisions is also demonstrated by a qualitative analysis of the fluorescence from 53D, 41D states.