COLLISIONAL-RADIATIVE MODEL FOR HELIUM AND ITS APPLICATION TO A DISCHARGE PLASMA

被引:164
作者
FUJIMOTO, T
机构
[1] Department of Engineering Science, Kyoto University, Kyoto
关键词
D O I
10.1016/0022-4073(79)90004-9
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
For the collisional-radiative model applied to helium, two alternative formulations are presented in which non-linear process such as ionization due to metastable-metastable collisions may be included. The atomic data, including dielectronic,recombination, employed in the calculations are summarized. The collisional-radiative calculation is applied to a positive-column plasma for which both the nonlinear processes and radiation trapping are taken into account. The calculated population densities of excited levels for a low-pressure and low-current discharge plasma show good agreement with a measurement made using the hook method. The population density distribution among excited levels is interpreted in terms of excitation-ionization mechanisms in the plasma. This leads to a grouping of the excited levels into two phases for the discharge plasma considered: the corona phase applies to the lower-lying levels and the quasi-saturation phase to the higher-lying levels. The importance of the ladder-like excitation-ionization mechanism is noted for this class of plasmas. © 1979.
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收藏
页码:439 / 455
页数:17
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