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Lifetimes and oscillator strengths for ultraviolet transitions in p ii, cl ii and cl iii
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Federman, S. R. Cheng, S. Schectman, R. M. Brown, M. Irving, R. E. Gibson, N. D. Fritts, M. C. |
| Copyright Year | 2006 |
| Description | Oscillator strengths for transitions in P II, Cl II and Cl III are derived from lifetimes and branching factions measured with beam-foil techniques. The focus is on the multiplets with a prominent interstellar line at 1153 A in P II which is seen in spectra of hot stars, and the lines at 1071 A in Cl II and 1011 A in Cl III whose lines are seen in spectra of diffuse interstellar clouds and the Io torus acquired with the Far Ultraviolet Spectroscopic Explorer. These data represent the first complete set of experimental f-values for the lines in the multiplets. Our results for P II (lambda)1153 agree well with Curtis semi-empirical predictions, as well as the large scale computations by Hibbert and by Tayal. The data for Cl II (lambda)1071 also agree very well with the most recent theoretical effort and with Morton s newest recommendations. For Cl III, however, our f-values are significantly larger than those given by Morton; instead, they are more consistent with recent large-scale theoretical calculations. Extensive tests provide confirmation that LS coupling rules apply to the transitions for the multiplets in Cl II and Cl III. |
| File Size | 104269 |
| Page Count | 4 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20060052449 |
| Archival Resource Key | ark:/13960/t8jd9tz4x |
| Language | English |
| Publisher Date | 2006-08-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Stellar Spectra Toruses Energy Levels Hot Stars Molecular Clouds Proving Oscillator Strengths Far Uv Spectroscopic Explorer Interstellar Matter Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
