标题： 利用激光等离子体在350至1000纳米光谱区域内识别新的金线 显示英文标题

标题： Identification of new gold lines in the 350 to 1000 nm spectral region using laser produced plasmas

摘要： 我们报告了一项试点研究的结果，该研究利用激光等离子体来识别r过程元素金（Au）在350至1000纳米光谱区域的新谱线，这对中子星合并的研究具有重要意义。 这是通过高纯度（99.95％）的金靶和低真空压强产生的金等离子体的光学-红外光谱实现的，以消除实验光谱中的空气污染。 我们的数据使用了焦距为750毫米、每毫米1200条刻线的光栅光谱仪记录，分辨率可达0.04纳米。 我们发现了54条之前未被识别且与金样本中的杂质（主要是铜（Cu）和银（Ag））无关的谱线。 在这54条谱线中，我们暂时将其中21条强烈的跃迁与包括原子结构计算到6s能级的能量水平的碰撞辐射模型的理论结果相匹配。 在我们光谱中剩余的33条未识别谱线中，有些也是强烈的，并可能与高于我们等离子体模型中能量水平的跃迁有关。 尽管如此，我们的实验表明，激光等离子体非常适合用于识别r过程元素中的跃迁，这种方法适用于从紫外到红外波长范围内的光谱。 显示英文摘要

摘要： We present results from a pilot study, using a laser-produced plasma, to identify new lines in the 350 to 1000 nm spectral region for the r-process element gold (Au), of relevance to studies of neutron star mergers. This was achieved via optical-IR spectroscopy of a laser-produced Au plasma, with an Au target of high purity (99.95 %) and a low vacuum pressure to remove any air contamination from the experimental spectra. Our data were recorded with a spectrometer of 750 mm focal length and 1200 lines mm-1 grating, yielding a resolution of 0.04 nm. We find 54 lines not previously identified and which are not due to the impurities (principally copper (Cu) and silver (Ag)) in our Au sample. Of these 54 lines, we provisionally match 21 strong transitions to theoretical results from collisional-radiative models that include energy levels derived from atomic structure calculations up to the 6s level. Some of the remaining 33 unidentified lines in our spectra are also strong and may be due to transitions involving energy levels which are higher-lying than those in our plasma models. Nevertheless, our experiments demonstrate that laser-produced plasmas are well suited to the identification of transitions in r-process elements, with the method applicable to spectra ranging from UV to IR wavelengths.