Rovibrational molecular populations, atoms, and negative ions in H2 and D2 magnetic multicusp discharges
Rovibrational molecular populations, atoms, and negative ions in H2 and D2 magnetic multicusp discharges
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H2 和 D2 磁性多尖点放电中的旋转分子群、原子和负离子
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
F. Hillion
中科院分区：
文献类型：
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作者：
M. Péalat;J. Taran;M. Bacal;F. Hillion
将相干反斯托克斯拉曼散射应用于磁性多轴H2和D2放电中旋转振动居群的研究。本课题对体积等离子体过程中负氢离子的形成很感兴趣。在振动能级v= 0,1和2上，高旋转态（J约5）的居布数明显高于玻尔兹曼定律的预期。在H2中，前4个振动能级的净居数近似遵循玻尔兹曼定律，振动温度为2390 K（在90 V‐10 a放电，55 μbar）。在相似的放电条件下，D2中状态v=3的总体高于玻尔兹曼定律的预期。在放电时，观察到H2和D2分子密度的不足，这可能是由于H和D原子的存在。通过对原子分数和温度的独立测量证实了这一点。通过光剥离技术测量的负离子密度也为零。
Coherent anti‐Stokes Raman scattering is applied to the study of rovibrational populations in magnetic multicusp H2 and D2 discharges. This subject is of interest to negative hydrogen ion formation by volume plasma processes. The populations of high‐lying rotational states (J≳5) in the vibrational levels v=0, 1, and 2 are found to be significantly higher than expected from the Boltzmann law. In H2 the net populations of the first four vibrational levels follow approximately the Boltzmann law, with the vibrational temperature of 2390 K (in a 90 V‐10 A discharge at 55 μbar). In similar discharge conditions, the population of the state v=3 in D2 is higher than expected from the Boltzmann law. In the presence of the discharge a deficiency in H2 and D2 molecule density was observed and was attributed to the possible presence of H and D atoms. This was verified by an independent measurement of the atomic fraction and temperature. The density of negative ions, measured by the photodetachment technique, is also r...