Abstract
The Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer aboard the Solar and Heliospheric Observatory (SOHO) recorded a large number of spectra in the 500-1600 A region. Although many of the detected lines have already been identified, the origins of a substantial fraction of the lines remain unknown. In this paper we report on a study of Mn VI and Fe VII in laboratory-generated vacuum spark spectra. Some of the Fe VII identified lines belonging to transitions of the type 3d4s-3d4p and 3d4p-3d4d were also observed in SUMER quiet-Sun and sunspot spectra. Because of the much lower manganese abundance in the solar atmosphere, none of the Mn VI lines were observed in the SUMER spectra.
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