高剥离态74W软X射线谱半连续带研究

ANALYSIS OF PSEUDO-CONTINUOUS BANDS OF SOFT X-RAY SPECTRA FROM A LASER-IRRADIATED HIGHLY IONIZED 74 W PLASMA

在星光—Ⅱ激光装置上，用ＰＥＴ平晶谱仪观测了７４Ｗ高离化度激光等离子体软Ｘ射线发射谱，波长范围是０．３６～０．５２ｎｍ。准确测量和辨认了３ｄｊ－ｎｆｊ（ｎ＝５，６）４条类Ｎｉ共振线及附近类Ｃｕ、类Ｚｎ、类Ｇａ和类Ｇｅ几个电离级１６个半连续带结构谱。实验谱波长测量误差小于０．０００５ｎｍ，与用相对论自旋轨道劈裂跃迁组（ＳＯＳＡ）模型（不可分辨跃迁组（ＵＴＡ）特例）和Ｘα法理论计算结果符合很好。首次提迭加峰平均波长与离子离化度间关系式。

On the Xingguang Ⅱ laser facilities a flat 74 W target was irradiated with a beam of a 50～100J, 600～800ps laser. The spectrum emitted from the laser-induced highly ionized 74 W plasma in the wavelength range of 0.36 ～0.52nm was recorded with a plane PET crystal spectrograph. The data of the spectrum were smoothed using the convolute sliding-conversion method with a dispersed functio. The positions of the emitted peaks were found with the symmetric zero-area conversion method. The wavelengths were calculated with the analytic method and the at least binomial -fitting method.The relative intensities and the full widths at half maximum (FWHM) were obtained. Using the X α method , relativistic correction (including the mass -speed effect. the Dawin effect and the spin-orbit interaction ) and the spin -orbit -split transition arrays (SOSA) model,the wavelengths of the 3d- n f( n =5,6) resonance lines in Ni-like ions as well as the mean wavelengths, the FWHMs and the total intensities of pseudo-continuous transition bands Cu-,Zn-, Ga- and Ge-like ions , were evaluated. Here all 41 electrons were considered as “spectators”. The analysis and the identification of all those predominant features in the range 0.36 ～0.52nm were achieved. The results of the model are in the excellent agreement with those of the experiment. We have got the succinct formulas of the mean wavelength vs the ionized stage of various types of packed peaks for each 3d- n f( n =5,6) transition band. These theoretical and experimental data are of important applications to nuclear fusion simulation, X-ray laser, plasma diagnostics, magnetic confine fusion, astrophysics and laboratory plasma physics.