类锂硅离子能级结构及软X射线激光光谱理论计算

Li-like Si ions energy level structure and Ab initio Si XII spectral calculation

本文采用Hartree-Fock自洽场方法,从理论上计算出类锂硅离子1s^2nl(n=2～7,l=0～5)各能级能量,并给出在极紫外(波长小于400(?))范围内各跃迁谱线的光谱性质、波长、振子强度和跃迁几率.对实验中已实现软X射线激光的跃迁(5d-3p,5f-3d,6d-3p,6f-3d),计算所得的跃迁波长与实验值完全相符.与现有文献的波长比较,相对误差不超过1%.

Relative encrgies of every Li-like Si ions energy lcvel (n=2-7) and ab initio Si XII wavelengths below 400A involving transitions between 1s2nl2L, levels up to n=7 are calculated. Corresponding transition probabilitics and line strengths are given. The accuracy of wavelength calculation is bettor than 1% comparing with ex sting data. The calculated wavelengths of Si XII 5d-3p, 5f-3d, 6d-3p and 6f-3d transitions are in good agreement (within 0.1%) with the observed transition wavelengths at which soft X-ray lasers have been experimentally demonstrated. The Si XII 7dZ-3p and 7f-3d transitions are of potential interest for X-ray lasers with shorter wavelengths towards the Water Window.