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Time-of-flight profile of multiply-charged ion currents produced by a pulse laser

机译：脉冲激光产生的多电荷离子电流的飞行时间曲线

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摘要

The ion emission from a Cu-plasma produced by a 308 nm excimer laser is analysed by time-of-flight spectroscopy and by deconvolution of measured ion currents. The ion current signals recorded by an ion collector outside the critical zone, where the charge-states of ions of the expanding plasma are frozen, have been deconvoluted by the use of the Kelly and Dreyfus equation. The meaningful recovered currents recorded for Cu+ and Cu2+, ions have been compared with the current signals reconstructed from the ion energy analyser spectra. A velocity distribution and the abundance of the above ions are presented. A time-resolved average charge-state of ions is also determined. The application of the law Q proportional to l(-2), based on the dilution of the total charge, Q, carried out by ions at long distances, l, from the target, is shown to be fundamental for a characterization of the laser-produced plasma.
机译：通过飞行时间光谱和通过对测得的离子电流进行去卷积分析，分析了由308 nm准分子激光产生的Cu等离子体的离子发射。由临界区外部的离子收集器记录的离子电流信号已通过使用凯利（Kelly）和德雷福斯（Dreyfus）方程进行了反卷积处理，该临界区在该区域冻结了膨胀等离子体的离子的电荷状态。已将记录的有关Cu +和Cu2 +离子的有意义的恢复电流与根据离子能分析仪光谱重建的电流信号进行了比较。给出了上述离子的速度分布和丰度。还确定了时间分辨的离子平均电荷态。基于总电荷Q的稀释，应用定律Q与l（-2）成比例，该定律是由距目标很远的离子l进行的总电荷Q的稀释，这对于表征激光器是至关重要的产生的血浆。

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