Comparison of atomic and molecular densities and temperatures of deuterium and hydrogen plasmas in a magnetic multipole source
Comparison of atomic and molecular densities and temperatures of deuterium and hydrogen plasmas in a magnetic multipole source
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磁性多极源中氘和氢等离子体的原子和分子密度以及温度的比较
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
H. Döbele
中科院分区：
文献类型：
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作者：
D. Wagner;B. Dikmen;H. Döbele
窄带宽相干真空紫外辐射的共振吸收被施加到氢和氘等离子体中的磁多极源，以确定电子分子基态以及原子密度和温度的旋转电子能级的人口。原子密度的变化作为放电参数的函数在两个不同的区域的等离子体源：中心区域和靠近壁。原子密度对压力和放电电流的强烈依赖性被观察到，以及在中心和边缘区域的值之间的相当大的差异。氢和氘放电之间的原子密度差异很小。和的振子能级的种群-仅在中心区域确定-对于所研究的能级没有表现出显著差异（v = 2至5和v = 3至6）-分布接近玻尔兹曼。分子平移温度-接近室温-与从氢的v = 2状态的前四个旋转状态和氘的v = 3状态的前六个旋转状态的布居确定的旋转温度非常一致。放电中存在的冷原子的分数表现出类似的温度。
Resonance absorption of narrow-bandwidth coherent vacuum UV radiation is applied to hydrogen and deuterium plasmas in a magnetic multipole source to determine populations of rovibronic levels of the electronic molecular ground state as well as atomic densities and temperatures. Variations of atomic densities are investigated as a function of discharge parameters in two different regions of the plasma source: the central region and close to the wall. A strong dependence of the atomic density on pressure and discharge current is observed as well as a considerable difference between the values in the central and the edge regions. The differences in atomic densities between discharges in hydrogen and deuterium are small. The populations of rovibronic levels of and - determined only in the central region - do not exhibit significant differences for the levels investigated (v = 2 to 5 for and v = 3 to 6 for ) - the distributions are close to Boltzmann. Molecular translation temperatures - close to room temperature - are in good agreement with the rotational temperatures determined from the population of the first four rotational states of the v = 2 state of hydrogen and the first six rotational states of the v = 3 state of deuterium. The fraction of cold atoms present in the discharges exhibits a similar temperature.