L壳层Al激光等离子体X射线光谱的实验测量和理论计算
Spectrum of L shell form laser produced aluminium plasma
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摘要: 在星光Ⅱ激光装置上开展了三倍频激光与铝平面靶相互作用实验，采用平场光栅谱仪获得了铝等离子3～6 nm范围的X射线发射谱。基于准相对多组态理论，考虑组态相互作用和Breit修正，采用Cowan程序计算了铝的L壳层跃迁波长和跃迁几率，辨识了实验测量得到的铝类Li到类B的22条跃迁谱线。研究表明：识别的谱线都是L壳层的2s，2p电子跃迁到了3p，3d等, 甚至更高的壳层，其测量得到跃迁的波长与理论值最大偏差只有0.06 nm。计算得到的振子强度与其它理论结果吻合很好。Abstract: Experiments of frequency-tripled laser beam on the Al flat target are carried on the XINGGUANG Ⅱ laser facility. A flat-grating spectrometer is used to measure Al plasma X-ray in the range of 3 nm to 6 nm. Based on relativistic multi configuration interaction, and taking account of CI interaction and correction of Berit, L shell lines have been computed by Cowan codes. A total of 22 spectral features are identified, and calculations agree with experimental emission spectra. Results show that identified lines belong to transitions from 2s, 2p of L shell to 3s, 3p shell, even higher shell, and maximum difference between our measurements and theoretical results is only 0.06 nm. The results of oscillator strength and other theoretical results are consistent.
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Key words:
- al plasma /
- l shell /
- transition /
- cowan code
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