The diagnostic ratio of the intercombination and resonance lines of He-like ions: influence of energetic electrons and non-stationarity
1995; Elsevier BV; Volume: 98; Issue: 1-4 Linguagem: Inglês
10.1016/0168-583x(95)00027-5
ISSN1872-9584
Autores Tópico(s)Plasma Diagnostics and Applications
ResumoA new explanation of the anomalous high ratio of the He-like intercombination (Y = 1s2−1s2p 3P1) and resonance (W = 1s2−1s2p 1P1) lines is proposed which essentially differs from the known mechanisms like inner shell ionization from the Li-like 1s22p levels and recombination from the H-like ions. The proposed mechanism is based on relaxation effects of allowed and forbidden components of the 1s2l levels in fast heated or cooled plasmas. It explains rations that are higher than the ratio of the statistical weights of the triplet and singlet 1s2l levels in hot transient regimes (where other methods fail) because it does not demand the presence of different ions beside the He-like ones. Low ratios can be entirely caused by relaxation effects in the heating phase and/or energetic electrons rather than by high electron density.
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