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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1970 Jun;66(2):282–288. doi: 10.1073/pnas.66.2.282

Excitation of Metastable Levels in Low Density Nebular Plasmas: [SII] and [ArIV]

S J Czyzak 1,2,3,*, T K Krueger 1,2,3,†, L H Aller 1,2,3,‡
PMCID: PMC283041  PMID: 16591841

Abstract

Diagnostics of low density nebular plasma by means of its forbidden line spectrum require not only a knowledge of certain intensity ratios as a function of its density and temperature but also a knowledge of the occupation numbers of relevant ionic levels. We present the necessary data for important levels of ionized sulfur and triply ionized argon.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Aller L. H. The [NeIV] Lines in High Excitation Gaseous Nebulae. Proc Natl Acad Sci U S A. 1970 Apr;65(4):775–780. doi: 10.1073/pnas.65.4.775. [DOI] [PMC free article] [PubMed] [Google Scholar]

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