At the Livermore electron-beam ion-trap facility, extreme-ultraviolet spectra of tungsten have been recorded in the wavelength range 4085 Å. The electron-beam energy was varied systematically to identify the individual spectra of Rb-like W37+ to Cu-like W45+. About 60 spectral features have been identified. PACS Nos.: 32.30Rj, 39.30+w, 31.50+w
We report on emission spectra of iron in the extreme ultraviolet recorded at an electron density of $5 Â 10 11 cm À3 at the Lawrence Livermore electron beam ion trap EBIT-II. We present a summary of observed emission lines, including wavelengths and emission intensities. We also illustrate our technique for isolating pure charge states of the desired ion and present spectra of pure Fe vii-Fe x. Our measurements add a large number of newly identified lines to existing line lists in the extreme-ultraviolet region, 60-140 Å . While many of these lines are quite weak, they add up to a significant flux that can seriously affect interpretations of global fitting models, especially when applied to stars with material at the appropriate temperatures, such as Procyon, Cen, and the Sun.
Transition probabilities of three magnetic dipole (M1) transitions in multiply charged ions of Ar have been measured using the Livermore electron-beam ion trap. Two of the transitions are in the ground conÐgurations of Ar XIV (B-like) and Ar IX (F-like), and are associated with the coronal lines at 4412.4 and 5533.4respectively. The third is in the excited 2s2p conÐguration of Be-like Ar XV and produces A , the coronal line at 5943.73Our results for the three atomic level lifetimes are 9.32^0.12 ms for the A . Ar X 2s22p5 level, 9.70^0.15 ms for the Ar XIV 2s22p level, and 15.0^0.8 ms for the Ar XVlevel. These results di †er signiÐcantly from earlier measurements and are the most accurate 3P 2 o ones to date.
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