A comparison of the C III, O V, F VI, and Ne VII Delta n = 0 (2-2) line emissions from a laboratory plasma with theoretical predictions and astrophysical observations
A comparison of the C III, O V, F VI, and Ne VII Delta n = 0 (2-2) line emissions from a laboratory plasma with theoretical predictions and astrophysical observations
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DOI：
10.1086/165032
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发表时间：
1987-02
期刊：
影响因子：
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通讯作者：
M. Finkenthal;T. L. Yu;S. Lippmann;L. K. Huang;H. Moos;B. Stratton;A. Bhatia
中科院分区：
文献类型：
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作者：
M. Finkenthal;T. L. Yu;S. Lippmann;L. K. Huang;H. Moos;B. Stratton;A. Bhatia
用光度校准的仪器测量了TEXT托卡马克发射的类Be离子、C III、O V、F VI和Ne VII的δ n = 0（2-2）跃态的光谱，并与几种不同模型的预测结果进行了比较，这些模型使用畸变波或r矩阵方法处理电子冲击激发。结果表明，从ciii到nevii的离子分布在等离子体边缘附近，密度在10的12次方和13次方/cu cm之间，并与几组计算结果进行了比较。利用r -矩阵技术，得到了实验数据与计算结果吻合的结果。由此得出结论，碰撞强度计算必须包括效应共振，特别是在低核电荷时。结果表明，所研究的谱线比可以可靠地用于实验室或天体物理等离子体的电子密度诊断。34岁的引用。
Spectra of the Delta n = 0 (2-2) transitions of Be I-like ions, C III, O V, F VI, and Ne VII emitted from the TEXT tokamak, were measured with photometrically calibrated instrumentation and compared to the predictions of several models which differ in their treatment of electron impact excitation, using either the distorted wave or R-matrix approach. It was found that the ions from C III to Ne VII were located near the edge of the plasma, at densities between 10 to the 12th and 13th/cu cm. The experimental line ratios were compared with several sets of computations. Agreement is obtained between the experimental data and computations by using the R-matrix technique. This leads to the conclusion that the effect resonances must be included in collision strength calculations, particularly at low nuclear charge. The results show that the line ratios studied may be used with confidence as electron density diagnostics for laboratory or astrophysical plasmas. 34 references.