金激光等离子体X射线精细结构谱研究

ANALYSIS OF FINE STRUCTURE OF X-RAY SPECTRA FROM LASER-IRRADIATED GOLD DOT

在“星光 -Ⅱ”钕玻璃激光装置上 ,聚焦三倍频激光束于真空室内Au微点靶表面 ,形成高剥离态热等离子体光源 .用Pentaerythritol(PET) ( 2d =0 .8742nm)平晶谱仪 ,摄录了Au离子在 0 .3— 0 .4nm范围内的X射线发射谱 .基于相对论性多组态Dirac Fock程序包 ,建立了相对论性次组态平均能计算程序 ,结合自旋 轨道劈裂跃迁系 (SOSA)理论 ,计算了Au离子类Cu至类Ge离子细致带结构谱孤立峰的中心波长和半高全宽 .2 6条 3d—nf(n =5 ,6 ,7)类Ni至类As离子子组态跃迁形成的孤立峰得到了辨认和归类 .

The X ray emission spectra from highly stripped plasma of gold has been observed by focusing a Nd\|glass frequency\|tripled laser beam onto the surface of the gold dot at the XINGGUANG Ⅱ laser facilities. The spectra of gold ions in the range of 0.0003?nm—0.0004?nm was recorded using the plate PET (2 d =0.8742?nm) crystal spectrometer. The code of average energy of relativistic subarrays was built on the basis of the code MCDF (Multi\|Configuration\|Dirac\|Fock). Using the spin\|orbit\|split\|arrays (SOSA) formalism, mean wavelengths and full widths at half height of isolated peaks of subarrays of lower charged gold ions, isoelectronic with Cu,Zn,Ga and Ge, was calculated. Twenty\|six lines are interpreted, they pertain mainly to transitions of 3d\| n f ( n =5,6, 7) of gold ions from Ni\|like to As\|like. These results of experiment and calculation have important application in plasma diagnostics and examination of high Z elemental atomic structure calculation.