A laboratory astrophysics problem
- Emission lines of singly charged ions populate many astrophysical spectra. However, the interpretation of the line intensities (usually line ratios) often depends on the transition rates of the decays of very long-lived low-lying levels. For example, the line ratio of two electric-dipole forbidden transitions in the \(3s^{2} 3p^{3}\) ground configuration of singly ionized sulfur (ion \(S^{+}\) , spectrum S II) has been interpreted in terms of a density diagnostic for planetary nebulae, i.e., for densities in the order of \(10^{4}\) \(cm^{−3}\) . The predicted lifetimes of the \(^{2}D^{o}_{3/2,5/2}\) levels are in the order of one hour. Modeling indicates that a 10% uncertainty of the lifetime determination in this case corresponds to a 50% uncertainty of the density diagnostic. The available theoretical lifetime predictions scatter by much more than 10%. Considerations about an experimental approach are presented with the goal of instigating a measurement of the actual level lifetimes.
| Author: | Elmar TräbertORCiDGND |
|---|---|
| URN: | urn:nbn:de:hbz:294-74431 |
| DOI: | https://doi.org/10.3390/atoms8020021 |
| Parent Title (English): | Atoms |
| Subtitle (English): | the lifetime of very long-lived levels in low-charge ions |
| Publisher: | MDPI |
| Place of publication: | Basel |
| Document Type: | Article |
| Language: | English |
| Date of Publication (online): | 2020/08/13 |
| Date of first Publication: | 2020/05/11 |
| Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
| Tag: | atomic spectroscopy; computations; ion trap; laboratory astrophysics |
| Volume: | 8 |
| Issue: | 2, Article 21 |
| First Page: | 21-1 |
| Last Page: | 21-18 |
| Institutes/Facilities: | Astronomisches Institut, Lehrstuhl für Astronomie |
| open_access (DINI-Set): | open_access |
| faculties: | Fakultät für Physik und Astronomie |
| Licence (English): |  Creative Commons - CC BY 4.0 - Attribution 4.0 International |
