中文摘要：

利用YAG脉冲激光烧蚀（PLA）空气环境中的Fe靶,观测激光诱导等离子体发射光谱。采用不同脉冲能量,对380.0~420.0 nm的等离子体发射光谱进行了时间、空间分辨研究。在局部热力学平衡条件下,根据所测谱线的相对强度,利用Saha方程得到等离子体电子温度约为104K。根据测得谱线的半峰全宽（FWHM）,推得等离子体电子密度约为1017cm-3。给出了靶面附近等离子体电子温度、电子密度的时间及空间演化规律。

英文摘要：

Laser-induced plasma spectroscopy of Fe target in air is investigated.Time and space-resolved spectra in the wavelength range of 380.0～420.0 nm are measured at different laser pulse energies.Under the model of local thermodynamic equilibrium,electronic temperature of Fe plasma is deduced to be around 104 K with assistance of Saha equation.Electron density of Fe plasma is obtained to be about 1017 cm-3 by use of the full-width at half maximum（FWHM） of Fe spectral lines.Spatio-temporal evolution,electron temperature as well as electron density near the target are presented.