金激光等离子体的空间分辨X射线发射谱及其应用

Space-resolved X-ray spectrum emitted from laser-produced gold plasma and its applications

在星光II激光装置上,采用PET平面晶体谱仪与宽20μm的狭缝构成一维空间分辨光谱测量系统,对金平面靶激光等离子体进行观测,获得了沿靶面法向一维空间分辨的金M带发射谱。在实验谱中观察到了Au元素类Ni离子的电四极跃迁线3p63d10(1S0) 3p53d104d(3/2,5/2)J=1。利用电四极跃迁线对电子密度的敏感特性,开展了金激光等离子体电子密度诊断的尝试,确定出利用该谱线进行电子密度诊断的有效范围大致在1019～4.5×1021cm-3之间。

On the XingguangII laser facility, one dimensional spaceresoved Mband spectra on Au plasmas produced laser irradiation of a plane target were measured by using a PET crystal spectrometer coupled with a slit of 20μm in width. In the experimental spectra, electric quadrupole transition line 3p63d10(1S0)3p53d104d(3/2,5/2)J=1 of Nilike Au was observed, and according to the sensitive characteristic of this line to electron density, diagnostics of the electron density of Au plasmas were discussed. In conclusion, the use of electric quadrupole line as a diagnostic tool of electron density is available in the range of about 1019～ 4.5×1021cm-3.