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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Time resolved study of CN band emission from plasma generated by laser irradiation of graphite
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Time resolved study of CN band emission from plasma generated by laser irradiation of graphite

机译：石墨激光辐照产生的等离子体的CN波段发射的时间分辨研究

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摘要

Time and space resolved studies of emission from CN molecules have been carried out in the plasma produced from graphite target by 1.06 mum pulses from a Q-switched Nd:YAG laser. Depending on the laser pulse energy, time of observation and position ofthe sampled volume of the plasma, the features of the emission spectrum are found to change drastically. The vibrational temperature and population distribution in the different vibrational levels have been studied as functions of distance, time, laserenergy and ambient gas pressure. Evidence for nonlinear effects of the plasma medium such as self focusing which exhibits threshold-like behaviour are also obtained. Temperature and electron density of the plasma have been evaluated using the relative line intensities of successive ionization stages of carbon atom. These electron density measurements are verified by using Stark broadening method.
机译：通过Q开关Nd：YAG激光器发出的1.06毫米脉冲，在石墨靶产生的等离子体中进行了时空分辨的CN分子发射研究。取决于激光脉冲能量，观察时间和等离子体的采样体积的位置，发现发射光谱的特征急剧变化。研究了不同振动水平下的振动温度和人口分布随距离，时间，激光能量和环境气压的变化。还获得了显示自阈值行为的等离子介质非线性效应（如自聚焦）的证据。已经使用碳原子的连续电离阶段的相对线强度评估了等离子体的温度和电子密度。这些电子密度测量值通过使用Stark展宽法进行验证。

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