摘要
用Nd :YAG脉冲激光烧蚀Al靶获得等离子体 ,脉冲能量固定在 1 45mJ·pulse- 1 。用Ar气作保护气 ,压强固定在 1个大气压 ,利用时空分辨技术 ,采集了靶前 0 5 ,1 5 ,2 5和 3 5mm处等离子体辐射的时空分辨谱。简要描述了各处等离子体的辐射特征 ,详细分析了各处连续辐射和Al原子辐射规律。根据这些位置处连续辐射和Al特征谱线的分布特征 ,简要论述了连续辐射和Al原子辐射的演化机制。认为Al原子对等离子体连续辐射吸收是形成Al原子辐射的主要机制 ,Al原子对连续辐射的共振吸收形成了叠加在连续谱上的宽带吸收谱。
The plasma was acquired with a pulsed Nd:YAG laser beam ablating aluminum, The pulse energy was set up to 145 mJ per pulse. Ar was used as surrounding gas with the pressure of 100 kPa. The radiation of the plasma was recorded with time- and space-resolved technique, so we obtained time-resolved, in 10(-9) s, spectra of the plasma radiation in front of the surface at 0.5 ram, 1.5 mm, 2.5 mm and 3.5 mm, respectively. Based on the spectra, we briefly discussed the characteristics of the plasma radiation in each zone, and studied the behavior of the continuum and aluminum radiation in detail, so the spatial profile of the plasma was obtained. As we found, at the beginning of the plasma coming into being, the radiation of the plasma was dominated by continuum radiation, but aluminum radiation became dominant later. Characteristic and ion radiation was much weaker than continuum radiation. The aluminum radiation lasted much longer than continuum and ion radiation, As a result, it was suggested that the absorption of continuum radiation of plasma by aluminum atoms should be the main mechanism for the formation of the aluminum double lines and the broad absorption spectra.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2003年第1期22-24,共3页
Spectroscopy and Spectral Analysis
