论文标题
快速离子在激光中产生铝等离子体的飞行行为的异常时间
Anomalous time of flight behavior of fast ions in laser produced aluminum plasma
论文作者
论文摘要
在这项工作中，使用Langmuir Probe（LP）和Speptroscopy（STOF）在AR环境下使用飞行时间（TOF）测量来研究由Q开关ND：YAG激光器产生的铝等离子体发出的多载离子的动力学。系统地研究了多电荷离子，背景中性和离子的时间演变，以实现不同的激光强度。时间进化表明，该研究中考虑的所有激光强度都具有双峰结构。快速峰值很鲜明，而慢速峰值与以前的研究相似。此外，较高的电荷离子具有较高的速度，表明在膨胀的最初时间阶段产生的瞬态电场的加速度。有趣的是，快速峰会延迟，而随着激光强度的增加，时间峰值的速度缓慢进展，这在较早的研究中尚未报道。观察结果表明，双极电场在TOF轮廓的意外行为中可能作用。
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 (LP) and spectroscopy (STOF) 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 the species have double peak structure for all the laser intensities considered in the study. The fast peak is sharp whereas the slow peak is broad 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 towards the possible role of ambipolar electric fields in the unexpected observed behavior of the TOF profiles.
