开4f壳层多电子中低价态钨离子光谱的实验和理论研究

中低价态钨光谱的研究可为聚变等离子研究提供原子参数，也可为高电荷态离子光钟的发展验证钟跃迁。电子束离子阱（EBIT）是对此进行研究的特色装置。由于结构复杂，目前仅对在4f壳层上有少量电子的部分钨光谱的研究相对准确，而对在4f壳层上有更多电子的情况，谱线辨识和理论计算精度仍存在问题。本项目将在课题组之前研究中低价态钨离子光谱的基础上，利用超低能EBIT装置，对开4f壳层多电子中低价态钨光谱进行研究。实验上首次在超低能EBIT上结合荷质比分析器，采用多波段光谱测量联合引出价态分析方法，理论上利用相对论多体微扰、相对论组态相互作用和多组态Dirac-Hartree-Fock等方法计算能级结构，利用辐射碰撞模型计算光谱强度，对比实验进行优化，重点关注电子关联效应，Breit和QED效应对计算精度的影响。本研究将提高钨离子光谱的辨识准确性和获得高精度标准谱，并改进开4f壳层多电子体系离子的计算精度。

Atomic data of tungsten ions in moderately charged states are needed for the study of physical process in tokamak plasmas, which can be used to verify the clock transitions of the HCI clock as well. Electron Beam Ion Trap (EBIT) is a unique tool for these studies. Because of the complex structure, the studies of moderately charged tungsten ions with few electrons in open 4f shell are relatively correct and problems still exist in those with more electrons in open 4f shell. This study, based on the previous work on tungsten spectroscopy in applicant’s group, will focus on the tungsten ions with multi-electrons in open 4f shell by using low energy EBIT. Experimently, it will be the first time to install the charge analyzer in the low energy EBIT and multi-range spectroscopy plus charge analyzing will be used to study. Theoretically, RCI, RMBPT and MCDHF methods will be used to calculate the energy levels and structures, while CR model will be adopted to calculate the line intensities. After that, calculations will be compared with the experimental results. Electron correlation, Breit and QED effects will be carefully studied to improve the calculations. The final result of this project will be a set of recommended wavelengths for a number of charge states of tungsten to be used in fusion diagnostics. It will also improve the precision of the calculations for the ions with multi-electron in open 4f shell.