Abstract Experimental Stark width broadening parameters (w) for 5 spectral lines of singly (Al II) and 8 spectral lines of doubly ionized aluminum atoms (Al III) are presented. The for Al III values are the first experimental data. The experiment was conducted in laser-induced plasma in helium‑hydrogen gas mixture at reduced pressure. The laterally resolved spectra are recorded side-on. The plasma parameters are inferred after applying inverse Abel transform. The electron densities ranging from (0.98–4.86)×1023 m−3 are estimated relying on broadening of hydrogen Hβ spectral line. The electron temperature in experiment was in the range 20 000 K to 28 000 K and it was determined applying Boltzmann and Saha-Boltzmann method. Stark broadening parameters for Al II and Al III spectral lines are compared with available experimental and theoretical results. We also present experimental Stark widths and shifts (d) for neutral helium 388.86 nm spectral line at electron densities above 1×1023 m−3, where the existing number of w and d data is limited. Some of new Al III w values are convenient for plasma diagnostics.

中文翻译：

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高电子密度下 Al II、Al III 和 He I 388.86 nm 谱线的明显展宽测量

摘要 给出了5条单离子(Al II)谱线和8条双电离铝原子(Al III)谱线的实验Stark宽度展宽参数(w)。Al III 值是第一个实验数据。该实验是在氦氢混合气体中的激光诱导等离子体中在减压下进行的。横向解析的光谱是从侧面记录的。在应用逆阿贝尔变换后推断等离子体参数。电子密度范围从 (0.98–4.86)×1023 m-3 估计依赖于氢 Hβ 谱线的展宽。实验中电子温度在20 000 K～28 000 K范围内，采用玻尔兹曼法和萨哈-玻尔兹曼法测定。将 Al II 和 Al III 谱线的明显展宽参数与可用的实验和理论结果进行比较。我们还展示了电子密度高于 1×1023 m-3 的中性氦 388.86 nm 谱线的实验斯塔克宽度和位移 (d)，其中现有的 w 和 d 数据数量有限。一些新的 Al III w 值便于等离子体诊断。