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Table 5

Theoretical soft X-ray emission lines of Mg viii.

Electron density (cm-3)
Transition Wavelength (Å) 108 109 1010

2s22p 2P1/2–2s2p3p 2D3/2 69.42a 0.08 0.06 0.05
2s22p 2P3/2–2s2p3p 2D5/2 69.47a 0.10 0.10 0.10
2s22p 2P1/2–2s23d 2D3/2 74.86a,b 0.79 0.57 0.55
2s22p 2P3/2–2s23d 2D5/2 75.03a,b 1.00 1.00 1.00
2s22p 2P3/2–2s23d 2D3/2 75.04a,b 0.16 0.12 0.11
2s2p22D5/2–2s2p3d 2F7/2 78.45 0.13 0.13 0.13
2s2p22D3/2–2s2p3d 2F5/2 78.57 0.13 0.10 0.09
2s2p22D5/2–2s2p3d 2D5/2 80.23a 0.06 0.05 0.05
2s2p22D3/2–2s2p3d 2D3/2 80.25a 0.05 0.04 0.04
2s2p24P5/2–2s2p3s 4P5/2 81.84a 0.05 0.05 0.05
2s22p 2P3/2–2s23s 2S1/2 82.82a 0.24 0.21 0.20
2s2p22D5/2–2s2p3s 2P3/2 86.84a 0.24 0.25 0.25
2s2p22D3/2–2s2p3s 2P1/2 87.02a 0.23 0.15 0.14
2s2p22S1/2–2s2p3s 2P3/2 92.13a 0.08 0.08 0.08
2s2p22S1/2–2s2p3s 2P1/2 92.32a 0.07 0.05 0.05
2s2p22D5/2–2s23p 2P3/2 96.79 0.29 0.27 0.27
2s2p22D3/2–2s23p 2P1/2 96.87 0.21 0.15 0.15

Notes.Intensities listed relative to I(75.03 Å).

(a)

Lines identified in the Chandra spectra of Procyon and α Cen A+B by Raassen et al. (2002) and Werner & Drake (2005).

(b)

Lines identified in solar spectra by Behring et al. (1972), Malinovsky & Heroux (1973) and Acton et al. (1985).

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