S. O. Kastner, M. Swartz, A. K. Bhatia, and J. Lapides, "Observations of n = 3 → n′ = 4 transitions in the Mg i and Si i sequences for elements chromium through zinc," J. Opt. Soc. Am. 68, 1558-1564 (1978)
Extreme ultraviolet spectra of 3p2-3p4d and 3p3d-3p4f transition arrays in twelve- and fourteen-electron ions, which differ by only a closed 3s2 subshell, are investigated in more detail than hitherto obtained for the elements chromium through zinc. The spectra were obtained with a two-meter vacuum spectrograph using a high-voltage spark source. Single- and multi-configuration calculations were carried out to compare predictions obtained for different model assumptions, and for the two different sequences.
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For a given level, entries in the first row are compositions for the magnesium-like ions of the elements in the column headings, while entries in the second row are compositions of the silicon-like ions.
For some levels of varying compositions along the sequences, the LS-coupling designations can be seen to be arbitrary to an extent.
TABLE III
3p2 − 3p4d and 3s3d − 3p4d transitions in magnesium-like ions.
Ekberg, Ref. 7.
Beckman, Ref. 9; Kelly and Palumbo, Ref. 8.
Svensson and Ekberg, Ref. 10.
These wavelengths have been given different classifications by Ekberg,7 who assigns 129.935 Å to 3s3p(3P2) − 3s4d(3D3), and by Fawcett et al.17 who assign 156.68 Å to 2s22p4(3P2) − 2s2p5(3P1); see text.
TABLE IV
Calculated transition probabilities Aki (s−1) and observed wavelengthsa λ(Å) of 3p3d − 3p4f and 3s3d − 3s4f transitions in magnesium-like ions.
λF refers to wavelengths given by Fawcett et al., Ref. 12.
Blends.
Edlen, Ref. 13.
Feldman et al., Ref. 14.
The classification suggested for this line differs from that of Fawcett et al.,12 who assign the line to 3s3d(1D2) − 3s4f(1F3). The line may be a blend.
TABLE V
Transition probabilities Aki (1011 s−1) for 3p2 − 3p4d and 3p3d − 3p4f transitions in silicon-like ions.
In Tables V and VI, it should be noted that the letter designations of 3p2 − 3p4d transitions are unrelated to the letters designating 3p3d − 3p4f transitions. In all cases the letter designations are consistent with the associated figures.
Fawcett et al., Ref. 12.
TABLE VI
Observed wavelengths of 3p2 − 3p4d, 3p3d − 3p4f, and possible 3s3p3 − 3p4f transitions in the Si i sequence.
Unclassified line observed by Fawcett et al., Ref. 12.
Blended with a line of the sodium-like ion.
Previously observed by Fawcett et al., Ref. 11, 12.
Here classified differently than Fawcett et al.
A line at 85.477 Å has been observed by Fawcett et al.12 and assigned by them to the 3p23d − 3p24f array of Fe xii
May be blended with 55.466 A classified as a line of the 3p6 − 3p54d array in Cu XII by Even-Zohar and Fraenkel18
TABLE VII
3p4d, 3p4f energy levels (cm−1) in silicon-like Ions.
For a given level, entries in the first row are compositions for the magnesium-like ions of the elements in the column headings, while entries in the second row are compositions of the silicon-like ions.
For some levels of varying compositions along the sequences, the LS-coupling designations can be seen to be arbitrary to an extent.
TABLE III
3p2 − 3p4d and 3s3d − 3p4d transitions in magnesium-like ions.
Ekberg, Ref. 7.
Beckman, Ref. 9; Kelly and Palumbo, Ref. 8.
Svensson and Ekberg, Ref. 10.
These wavelengths have been given different classifications by Ekberg,7 who assigns 129.935 Å to 3s3p(3P2) − 3s4d(3D3), and by Fawcett et al.17 who assign 156.68 Å to 2s22p4(3P2) − 2s2p5(3P1); see text.
TABLE IV
Calculated transition probabilities Aki (s−1) and observed wavelengthsa λ(Å) of 3p3d − 3p4f and 3s3d − 3s4f transitions in magnesium-like ions.
λF refers to wavelengths given by Fawcett et al., Ref. 12.
Blends.
Edlen, Ref. 13.
Feldman et al., Ref. 14.
The classification suggested for this line differs from that of Fawcett et al.,12 who assign the line to 3s3d(1D2) − 3s4f(1F3). The line may be a blend.
TABLE V
Transition probabilities Aki (1011 s−1) for 3p2 − 3p4d and 3p3d − 3p4f transitions in silicon-like ions.
In Tables V and VI, it should be noted that the letter designations of 3p2 − 3p4d transitions are unrelated to the letters designating 3p3d − 3p4f transitions. In all cases the letter designations are consistent with the associated figures.
Fawcett et al., Ref. 12.
TABLE VI
Observed wavelengths of 3p2 − 3p4d, 3p3d − 3p4f, and possible 3s3p3 − 3p4f transitions in the Si i sequence.
Unclassified line observed by Fawcett et al., Ref. 12.
Blended with a line of the sodium-like ion.
Previously observed by Fawcett et al., Ref. 11, 12.
Here classified differently than Fawcett et al.
A line at 85.477 Å has been observed by Fawcett et al.12 and assigned by them to the 3p23d − 3p24f array of Fe xii
May be blended with 55.466 A classified as a line of the 3p6 − 3p54d array in Cu XII by Even-Zohar and Fraenkel18
TABLE VII
3p4d, 3p4f energy levels (cm−1) in silicon-like Ions.
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