物理
离子
双极扩散
等离子体
原子物理学
电场
朗缪尔探针
等离子体诊断
激光器
光谱学
飞行时间
带电粒子
光学
核物理学
量子力学
作者
Garima Arora,Jinto Thomas,Hem Chandra Joshi
出处
期刊:Physics of Plasmas
[American Institute of Physics]
日期:2022-07-01
卷期号:29 (7): 072101-072101
摘要
In this work, dynamics of multi-charged ions emitted from an aluminum plasma produced by Q switched Nd: Yag laser is studied using time of flight (TOF) measurements from Langmuir probe and spectroscopy under Ar ambient of 0.02 mbar. The temporal evolution of multi-charged ions, background neutrals, and ions is systematically studied for varying laser intensities. The temporal evolution shows all species have double-peak structure for all laser intensities considered in the study. The fast peak is sharp whereas the slow peak is broadly similar to that observed in previous studies. Moreover, higher charged ions have higher velocity, indicating acceleration from the transient electric field produced at the very initial temporal stages of expansion. Interestingly, the fast peak gets delayed, whereas the slow peak advances in time with increased laser intensity, which has not been reported in earlier studies. The observations point toward the possible role of ambipolar electric fields in the unexpected observed behavior of the TOF profiles.
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