We present in this work the first study of the spectra of Sc xiv, Ti xv, and V xvi. Altogether, 42 new lines in the range of 18–25 Å were identified and classified. We also give semiempirical formulas for calculating the intervals between the ground levels. Using these formulas we changed the values of the singlets in Cl x. We also present identifications of Ar xi lines.
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Measured and extrapolated intervals between the ground-configuration levels 3P2–3P1 and 3P1–3P0, ΔP12 and ΔP01, respectively, in the O i isoelectronic sequence.
Measured and extrapolated intervals between the ground-configuration levels 3P2–3P1 and 3P1–3P0, ΔP12 and ΔP01, respectively, in the O i isoelectronic sequence.