W^(6+)离子的电子碰撞电离研究  

Theoretical investigation of electron-impact ionization of W^(6+) ion

作　　者：马莉莉 张世平 张芳军 李麦娟 蒋军 丁晓彬 颉录有 张登红 董晨钟 Ma Li-Li;Zhang Shi-Ping;Zhang Fang-Jun;Li Mai-Juan;Jiang Jun;Ding Xiao-Bin;Xie Lu-You;Zhang Deng-Hong;Dong Chen-Zhong(Key Laboratory of Atomic and Molecular Physics&Functional Materials of Gansu Province,College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070 China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃省原子分子物理与功能材料重点实验室,兰州730070

出　　处：《物理学报》2024年第12期136-146,共11页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12364034);甘肃省科技计划(批准号:23YFFA0074)资助的课题。

摘　　要：采用细致能级扭曲波方法计算了W^(6+)离子基态[Kr]4d^(10)5s^(2)4f^(14)5p^(6)和亚稳态[Kr]4d^(10)5s^(2)4f145p^(5)5d^(1),[Kr]4d^(10)5s2^(4)f^(13)5p^(6)5d^(1),[Kr]4d^(10)5s^(2)4f^(14)5p^(5)5f1,[Kr]4d^(10)5s^(2)4f^(13)5p^(6)5f^(1)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,本文采用了3种模型来确定母离子束中处于长寿命能级的比值.与Pindzola和Griffin(1997 Phys.A 561654)的理论结果和Stenke等(1995 J.Phys.B:At.Mol.Opt.Phys.282711)实验结果进行比较,发现在考虑了亚稳态的贡献后本文结果与Stenke等的实验结果吻合得很好.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,thus 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 model is currently being used to evaluate the behavior of tungsten impurities and their influence 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 are calculated by using the level-to-level distorted-wave(LLDW)method.The contributions of direct ionization(DI)cross section and excited autoionization(EA)cross section to the total EISI cross section are primarily considered.Comparison of our calculation results with the experimental data from Stenke et al.(Stenke M,Aichele K,Harthiramani D,Hofmann G,Steidl M,Volpel R,Salzborn E 1995 J.Phys.B:At.Mol.Opt.Phys.282711)reveals that the EISI cross section considering only the ground state is significantly smaller than the experimental result.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 are employed.Our results,which include the contribution of metastable states,accord well with the experimental results of Stenke et al.Compared with the theoretical calculation result of Pindzola et al.our calculaiton provides a more com

关 键 词：钨离子 电子碰撞 亚稳态 直接电离 激发自电离 

分 类 号：O56[理学—原子与分子物理]