Excited‐state densities in a multicathode‐spot Al vacuum arc. I. Spectroscopic measurements
Excited‐state densities in a multicathode‐spot Al vacuum arc. I. Spectroscopic measurements
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多阴极点铝真空电弧中的激发态密度 I. 光谱测量。
DOI：
10.1063/1.328145
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发表时间：
1980
影响因子：
3.2
通讯作者：
S. Goldsmith
中科院分区：
文献类型：
--
作者：
R. Boxman;S. Goldsmith
通过测量绝对谱线强度，确定了在真空环境中，由直径12 mm、间距4.4 mm的铝对电极之间的1.2kA峰值电流0.65ms的HAFW放电产生的极间等离子体中的激发态密度。Al I3s2 4s2S、Al II 3p2 1D和Al III 4p 2p态的密度除以峰值电流附近的中面简并度分别为8×10 14、2×10 16和3×10 16m−3。所研究的AlⅡ和Al III态的密度可分别用1.1 eV和1.2 eV的分布温度来描述。随着距离阴极距离的增加，Al I和Al II的密度从靠近阴极的最大值开始下降，而Al I的密度在靠近阳极时略有升高，而Al III态一般从靠近阴极的最小值开始上升，在中面之后达到最大值。随着时间的推移，Al-III密度在电流峰值附近达到最大值，然后迅速衰减，而Al-II密度在0.2ms左右达到最大值。
Excited‐state densities in the interelectrode plasma produced by a 1.2‐kA‐peak‐current 0.65‐ms HAFW discharge between Al butt electrodes, 12 mm in diameter spaced 4.4 mm apart and located in a vacuum ambient, were determined by measurement of the absolute line intensities. Densities divided by degeneracies at midplane near peak current for the Al I 3s2 4s2S, Al II 3p2 1D, and Al III 4p 2p states were 8×1014, 2×1016, and 3×1016 m−3, respectively. Densities in Al II and Al III states studied could be described by distribution temperatures of 1.1 and 1.2 eV, respectively. As a function of distance from the cathode, Al I and Al II densities declined from their maximum near the cathode, with the Al I density rising slightly near the anode, while Al III states generally rose from minimum values near the cathode, reaching maximums after midplane. As a function of time, Al III densities reached a maximum near current maximum, and then decayed rapidly, while Al II densities reached their maximum about 0.2 ms after...