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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。
Laser-induced plasma emission spectra were observed using a YAG pulsed laser ablation (PLA) target in the air. Using different pulse energies, the emission spectra of the plasma at 380.0-420.0 nm were studied in time and space. Under local thermodynamic equilibrium conditions, the plasma electron temperature is about 104K using the Saha equation according to the relative intensity of the measured line. Based on the full width at half maximum (FWHM) of the measured line, the plasma electron density is estimated to be about 1017 cm-3. The temporal and spatial evolution of plasma electron temperature and electron density near the target surface are given.