锡和氙离子在13.5nm波长附近的光谱特性

Spectral characteristics of tin and xenon near 13.5nm

应用多组态Dirac—Foek方法，系统计算了锡（Sn）和氙（Xe）离子在13．5nm波长附近的辐射跃迁波长和跃迁几率。深入分析了Sn^（7-13）＋和Xe^（7-13）＋离子跃迁的原子光谱特性，研究了相对论效应和电子关联效应对能级位置和跃迁几率的影响发现，相对论效应和电子关联效应对光谱能量的影响分别为2％和5％。并从光谱特性的角度对比讨论了Sn和Xe作为极端远紫外光源的优劣，发现Sn更有优势。

By using the multiconfiguration Dirac-Fock method, the radiative transition energies and transition probabilities of tin and xenon atoms in the ionization degree range from 7 to 13 are systematically calculated, and their convoluted spectra at wavelength near 13.5 nm are provided. The relativistic effect is found to increase the spectral energy by 2%, while the electronic correlation effect reduces the spectral energy by 5% in general. By comparing the emitted spectra from tin and xenon, the authors find that tin is a more efficient candidate element as the extreme ultraviolet（EUV） sources than xenon in view of the spectra.