标题： W$^{26+}$在 EBIT 等离子体中的光谱性质的理论研究 显示英文标题

标题： Theoretical investigation of spectroscopic properties of W$^{26+}$ in EBIT plasma

摘要： 能量水平、辐射跃迁波长和概率已使用多组态狄拉克-福克和狄拉克-福克-斯莱特方法对W$^{26+}$离子进行了研究。 日冕和碰撞-辐射模型已被用于确定低密度电子束离子阱(EBIT)等离子体中的谱线和相应组态。 通过给出组态相互作用强度，估算了$4f^{2}$、$4d^{9}4f^{3}$、$4f5l$ ($l=0,...,4$)、$4fng$ ($n=5, 6, 7$) 组态的相关效应。 确定对于单组态方法中对应的弱电八极跃迁的 $4f5s \rightarrow 4f^{2}$ 跃迁，相关效应是重要的。 相关效应通过增加跃迁概率一个数量级来影响 $4f5d \rightarrow 4f^{2}$ 跃迁。 已经提出了对在聚变等离子体中观测到的一些谱线的识别。 光谱建模显示来自 $4f5s \rightarrow 4f^{2}$ 跃迁的谱线显著增加。 其他来自 $10-30$ nm 区域的跃迁可能对 EBIT 等离子体有兴趣。 显示英文摘要

摘要： Energy levels, radiative transition wavelengths and probabilities have been studied for the W$^{26+}$ ion using multiconfiguration Dirac-Fock and Dirac-Fock-Slater methods. Corona and collisional-radiative models have been applied to determine lines and corresponding configurations in a low-density electron beam ion trap (EBIT) plasma. Correlation effects for the $4f^{2}$, $4d^{9}4f^{3}$, $4f5l$ ($l=0,...,4$), $4fng$ ($n=5, 6, 7$) configurations have been estimated by presenting configuration interaction strengths. It was determined that correlation effects are important for the $4f5s \rightarrow 4f^{2}$ transitions corresponding to weak electric octupole transitions in a single-configuration approach. Correlation effects influence the $4f5d \rightarrow 4f^{2}$ transitions by increasing transition probabilities by an order of magnitude. Identification of some lines observed in fusion plasma has been proposed. Spectra modeling shows strong increase of lines originating from the $4f5s \rightarrow 4f^{2}$ transitions. Other transitions from the $10-30$ nm region can be of interest for the EBIT plasma.