Using a grazing-incidence spectrometer and a low-inductance 14-μF, 12–15-kV spark source, we have observed spectra of Mg x, Al xi, and Si xii. About 50 new lines are reported between 25 and 65 Å, arising from transitions between the lowest 2s and 2p configurations and ns, np, and nd configurations, where n≥3.
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All intensity estimates are from our plates.
Reference 1—included here for convenience.
Reference 2—included here for convenience.
Ferner’s value of 45.656 Å is here corrected.
First reported by Tondello.4
Reference 3—included here for convenience.
First reported in the spectrum of the sun [see R. Tousey, W. E. Austin, J. D. Purcell, and W. G. Widing, Ann. Astrophys. 28, 755 (1965)].
Obscured by 27.909-Å line.
Blurred by C vi 26.99 Å.
Table II
Energy levels of lithium-like spectra in Mg, Al, and Si.
All intensity estimates are from our plates.
Reference 1—included here for convenience.
Reference 2—included here for convenience.
Ferner’s value of 45.656 Å is here corrected.
First reported by Tondello.4
Reference 3—included here for convenience.
First reported in the spectrum of the sun [see R. Tousey, W. E. Austin, J. D. Purcell, and W. G. Widing, Ann. Astrophys. 28, 755 (1965)].
Obscured by 27.909-Å line.
Blurred by C vi 26.99 Å.
Table II
Energy levels of lithium-like spectra in Mg, Al, and Si.