The intrinsic time resolution of the beam-foil light source has been utilized in order to single out and to identify intercombination lines in the Mg i, Al i, and Si i isoelectronic sequences for ions with nuclear charge Z = 18–30 (Ar, Ti, Cr, Mn, Fe, Co, Ni, Cu, and Zn). The method is described, and wavelength and lifetime data are presented. For the ions in the Al i and Si i sequences, the level positions of the high–spin term systems (lowest quartet and quintet levels, respectively) have been determined.
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In all spectra for Ti–Zn the 3s2 1So–3s3p3P°i transition in the Mg i–like ion12,14 served as a wavelength reference. For the isoelectronic systematics, see Figs. 2 and 3. Wavelength values stated without reference are from Refs. 27, 28, and 31 and from this work. Ref. 20 Ref. 33. Ref. 55. Ref. 34.
Table 2
Excitation Energies T (cm−1) of the Lowest Levels of the Highest Spin-Term System in the Al i and Si i Sequences as Determined from Fits To Our Intercombination Line Wavelength Data in Combination with Otherwise Known Fine-Structure Intervalsa
For examples, see Refs. 57–61 and 66–71.
All values are the fit result with a low–order polynomial (see text).
Δ is the deviation
.
A, averaged result from individual wavelengths; F, fit result with low—order polynomial (see text).
The
transition is blended with the
line.28 The fitted level position of 4P3/2 in this case is probably better than the one derived from the individual measurement.
Table 3
Experimental Lifetimes (in nanoseconds) of High-Spin States in the Mg i, Al i, and Si i Sequencesa
In all spectra for Ti–Zn the 3s2 1So–3s3p3P°i transition in the Mg i–like ion12,14 served as a wavelength reference. For the isoelectronic systematics, see Figs. 2 and 3. Wavelength values stated without reference are from Refs. 27, 28, and 31 and from this work. Ref. 20 Ref. 33. Ref. 55. Ref. 34.
Table 2
Excitation Energies T (cm−1) of the Lowest Levels of the Highest Spin-Term System in the Al i and Si i Sequences as Determined from Fits To Our Intercombination Line Wavelength Data in Combination with Otherwise Known Fine-Structure Intervalsa
For examples, see Refs. 57–61 and 66–71.
All values are the fit result with a low–order polynomial (see text).
Δ is the deviation
.
A, averaged result from individual wavelengths; F, fit result with low—order polynomial (see text).
The
transition is blended with the
line.28 The fitted level position of 4P3/2 in this case is probably better than the one derived from the individual measurement.
Table 3
Experimental Lifetimes (in nanoseconds) of High-Spin States in the Mg i, Al i, and Si i Sequencesa
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