Abstract
The spectrum of tin was photographed in 150-535 AA wavelength region on a 10.7m grazing incidence spectrograph. The source used was a triggered spark. The analysis of the 4d7-4d65p transition array of Sn VIII led to establishing 18 of 19 energy levels of the 4d7 ground state and 145 of 180 energy levels of the 4d65p excited state. 381 lines have been classified in the 197-248 AA region. The least-squares-fitted (LSF) parametric calculations support the analysis. The parameter scaling factors have been compared in the Tc I isoelectronic sequence.
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