Transitions of fe XVIII and fe XIX Observed in Laser-Produced Plasmas

Abstract

Lines of Fe xvm and Fe XIX near 100 A have been ohserved in spectra from plasmas produced by 5-joule laser pulses of 0.9 ns duration. These lines produced by transitions of the type 2s2 +1 Transitions of the type -131 are prominent in the spectra below 20 A observed during solar flares. The splittings of the ground levels are obtained and compared with isoelectronic extrapolations. The corresponding forbidden lines as well as the allowed lines near 100 A inay be observable in flare spectra with some of the instruments to be flown on Skylab. Subject headings: flares, solar - spectra, ultraviolet - spectra, X-ray