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本文采用细致能级扭曲波方法(level-to-level distorted-wave, LLDW)计算了W6+离子基态[K r]140d 52s 4 和亚稳态[K r]140d 52s 41f4、[Kr]4d105s24f135p65d1、[Kr]4d105s24f145p55f1和[Kr]4d105s24f135p65f1的电子碰撞单电离(EISI)截面.为了考虑亚稳态离子对电离的贡献,我们使用了三种模型来确定母离子束中处于长寿命能级的比值.与Pindzola等的理论结果和Stenke等实验结果进行比较,发现在考虑了亚稳态的贡献后我们的结果和Stenke等的实验结果吻合的很好.Due to its unique characteristics, metal tungsten has been selected as the wall material for the tokamak magnetic confinement fusion device. The wall material directly interacts with the plasma for a long time, causing tungsten atoms and ions to be sputtered and ionized into different charge states, which then enter the tokamak device as plasma impurities. To ensure stable plasma combustion conditions, highly complex modeling is currently being conducted to evaluate the behavior of tungsten impurities and their impact on the tokamak plasma. This requires various high-precision atomic data for tungsten atoms and different ionized states of tungsten ions. Electron collision ionization, as a fundamental atomic physical process, is widely encountered in laboratory and astrophysical plasma environments. The parameters such as electron collision ionization cross-sections and rate coefficients are crucial for plasma radiation transport simulations and state diagnostics.Electron-impact single-ionization (EISI) cross sections of the ground state and metastable state for W6+ ions have been calculated using the level-to-level distorted-wave (LLDW) method. The contribution of direct ionization (DI) and excited autoionization (EA) cross sections to the total EISI cross section has been primarily considered.Comparison of our calculated results with the experimental data from Stenke et al. reveals that the EISI cross section considering only the ground state is significantly smaller than the experimental findings. Therefore, it is imperative to take into account the contribution from the metastable state. To determine the fraction of ions in long-lived energy levels within the parent ion beam, three models have been employed.Our results, which include the contribution of metastable states, agree well with the experimental spectrum of Stenke et al. Comparing with the theoretical calculations of Pindzola et al. our calculaiton provides a more comprehensive understanding of the electron-impact single-ionization processes for W6+ ions. The comparison is illustrated in Figure.Fig. Comparison of our W6+ ions fitting EISI with experiment[24]. Red、green and blue solid line respresent the results of the model 1、model 2 and model 3, respectively. The black solid line is the EISI cross section of ground state 4f145p6.
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Keywords:
- Tungsten ions /
- Electron-impact /
- Metastable states /
- DI /
- EA
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