Additions to the Spectrum of Fe ix in the 110-200 Å Region

The spectrum of eight-times ionized iron, Fe ix, was studied in the 110-200 angstrom region. A low inductance vacuum spark and a 3 m grazing incidence spectrograph were used for the excitation and recording of the spectrum. Previous analyses of Fe ix have been greatly extended and partly revised. The number of known lines in the 3p (5)3d-3p (5)4f and 3p (5)3d-3p (4)3d (2) transition arrays is extended to 25 and 81, respectively. Most of the identifications of the Fe ix lines from the 3p (5)3d-3p (4)3d (2) transition array in the solar spectrum have been confirmed and several new identifications are suggested.

Automated summary

The spectrum of eight-times ionized iron, Fe ix, was studied in the 110-200 angstrom region. The analysis of Fe ix has been extended and revised, confirming most of the identifications of the spectrum lines and suggesting new ones.