利用类铜离子谱线诊断银等离子体电子密度

DIAGNOSTICS OF ELECTRON DENSITY OF LASER-PRODU-CED PLASMA FROM THE XUV SPECTRA OF AgXIX

测量了激光加热块状银靶产生的等离子体XUV光谱.计算了T_e分别为65eV,86eV和130eV时,AgXIX4s-4P,4P-4d,4d-4f7条谱线在不同电子密度时的强度.根据AgXIX 4d^2D_(s/2^-)4f^2F_(r/2)和4P^2P_(3/2)-4d^2D_(s/2)两条谱线的强度比,推导了激光银等离子体电子密度.当入射激光功率密度W为6×10^(12)W/cm^2时,银等离子体电子密度N_e=1×10^(20)/cm^3.

The XUV spectra from AgXIX of laser-produced plasma are measured. The density dependence of △n= 0 (4-4) transitions from AgXIX has been studied in a density range 1017-1022 cm-3 with the collisional radiative model. The theoretical model included the effect of cascading from n= 5 states on the population of the n =4 levels. In addition, optical depth effects on the line intensities were considered. The two transitions of 4d2D5/2 4f2F7/2 and 4p2P3/2-4d2D5/2 remain close to each other and are unblended with other lines. Calculations of their radiation intensity ratio vs the electron density are performed. Electron density of laserproduced plasma has been deduced from the ratio.