Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304..838s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 304, May 15, 1986, p. 838-848. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
36
Atomic Spectra, Iron, Metal Ions, Solar Flares, Solar Spectra, Transition Probabilities, X Ray Spectra, Frequency Shift, Line Spectra, Quantum Electrodynamics, Resonance Lines, Wavelengths
Scientific paper
The wavelengths of inner-shell 1s-2p transitions in the ions Fe XVIII-XXIV have been measured in solar flare spectra recorded by the Naval Research Laboratory crystal spectrometer (SOLFLEX) on the Air Force P78-1 spacecraft. The measurements are compared with previous measurements and with recently calculated wavelengths. It is found that the measured wavelengths are systematically larger than the wavelengths calculated using the Z-expansion method by up to 0.65 mA. For the more highly charged ions, these differences can be attributed to the QED contributions to the transition energies that are not included in the Z-expansion calculations.
Feldman Uri
Safronova U. I.
Seely John F.
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