U. Feldman,1*
L. Katz,1
W. Behring,2
and L. Cohen2
1Department of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
2Laboratory for Solar Physics, Goddard Space Flight Center, Greenbelt, Maryland 20771
*Part of this work was done as a NASA-National Academy of Science, National Research Council Postdoctoral Research Associate at Goddard Space Flight Center.
Highly ionized spectra of Fe, Co, Ni, and Cu belonging to the Na I and Mg I isoelectronic sequences are discussed. For the Na I-type spectra about 48 lines between 20 and 400 Å are classified for the first time. The wavelengths of some 20 other previously classified lines are given with greater accuracy. The measurement of the n = 3 transitions and of the higher-series lines has enabled us to construct the energy-level table and to obtain accurate least-square fits for the series limits and ionization potentials. For the Mg I sequence, nine new lines are classified in Fe xv and Co xvi and 36 lines in Ni xvii and Cu xviii. Not enough lines are yet classified to deduce the values of the energy levels.
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c = calculated.
m = measured.
R. L. Kelly, Atomic Emission Lines Below 2000 Angstroms, NRL Rept. 6648 (U. S. Govt. Printing Office, Washington, D. C., 1968).
Coincides with 2 × 180.399 Å.
Not experimentally observed. λ and ν interpolated along the isoelectronic sequence.
Calculated.
Coincides with 4 × 66.263 Å.
Measured by Edlén, Ref. 3.
First measured by Feldman el al., Ref. 4.
Coincides with Carbon 40.270 Å.
Not certain.
Obscured by 27.982-Å line.
Obscured by 2 × 12.573 Å.
Coincides with 26.020 Å.
Coincides with 2 × 14.424 Å.
Broad.
Blurred by second order of 15.62 Å.
c = calculated.
m = measured.
R. L. Kelly, Atomic Emission Lines Below 2000 Angstroms, NRL Rept. 6648 (U. S. Govt. Printing Office, Washington, D. C., 1968).
Coincides with 2 × 180.399 Å.
Not experimentally observed. λ and ν interpolated along the isoelectronic sequence.
Calculated.
Coincides with 4 × 66.263 Å.
Measured by Edlén, Ref. 3.
First measured by Feldman el al., Ref. 4.
Coincides with Carbon 40.270 Å.
Not certain.
Obscured by 27.982-Å line.
Obscured by 2 × 12.573 Å.
Coincides with 26.020 Å.
Coincides with 2 × 14.424 Å.
Broad.
Blurred by second order of 15.62 Å.