测量了大气压环境下氩气空心针-板放电等离子体中原子与分子谱线强度的空间分布,分析了等离子体中电子能量的空间分布.实验利用空心针-板放电装置,得到了约3 cm长的放电等离子体弧.在300～800 nm范围内采集发射光谱,发现了强度较高的Ar I谱线、N2第二正带系谱线C 3Ⅱu(v=o)→B 3皿(v=0)以及强度较弱的OI谱线.实验测量了N2谱线(337.1,357.6及380.4nm)、氩原子谱线(696.54,763.51,772.42及794.82mn)和OI 777.2nm谱线强度的空间分布,结果表明:氯分子谱线强度由弧根开始逐渐升高,当距离弧根12mm时强度达到最大值并开始下降；氩原子谱线强度由弧根到弧梢逐渐降低；氧原子谱线强度从弧根开始逐渐升高,当距离弧根6mm时强度达到最大值并开始下降.定性地讨论了等离子体弧中电子能量分布,发现距离弧根为6mm处电子能量最高,而弧根处电子能量最低.%In the present work, the spatial distributions of spectrum intensity of molecule and atom in the plasma generated in hollowneedle-plate discharge in atmosphere were measured, and the spatial distribution of electron energy in plasma was analyzed. A plasma about 3cm long is generated by using a hollowneedle-plate discharge device. By collecting optical emission spectrum from 300 to 800 nm, it was found that the spectrum consists of strong Ar I lines, strong second positive band system of N2, and weak OI line. The spatial distributions of spectrum intensity of Ar I (696. 54, 763. 51, 772. 42, and 794. 82 nm), band N2 (337.1, 357. 6, and 380. 4 nm), and () I 777. 2 nm were measured. The Ar I lines decreased gradually from the arc root. The N2 lines increased gradually from the arc root and declined when they reached a maximum at 12 mm away from the arc root The intensity of OI increased from the arc root and declined when it reached a maximum at 6 mm away from the arc root The spatial distribution of electron energy in plasma was analyzed qualitatively from the spatial distribution of spectrum intensity given above. It was found that the electrons located at 6 mm away from the arc root have high energy, while they have low energy at arc tip.
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