Abstract
Tungsten spectra excited in the vacuum sparks of different setups and electric circuits were recorded on two high-resolution vacuum spectrographs. For the region 190–500 Å, a 10 m normal incidence spectrograph with a 3600 lines/mm grating was used in the Meudon Observatory. In the region below 350 Å, a set of spectra was produced using a 3 m grazing incidence spectrograph with a 3600 lines/mm grating in the Institute of Spectroscopy in Troitsk. A total of 187 lines in the region 160–271 Å were identified as transitions to the low-lying odd configurations 4f135s25p6 and 4f145s25p5 from the interacting excited even 4f125s25p65d + 4f135s25p5(5d + 6s) + 4f145s25p4(5d + 6s) + 4f145s5p6 configurations. It was found that 4f135s25p62F7/2 is the ground level of W VIII. The fine structure splitting and relative positions of the odd terms were established, and 98 levels of the excited even configurations were found.
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