ANALYSIS OF THE 4D(7)(4F-VII, SB-VIII AND TE-IX(6P) AND 4P(5)4D(9) CONFIGURATIONS OF SN)

The spectra of tin, antimony and tellerium were photographed in the 12 0-200 Angstrom region on 10.7m and 3m grazing incidence spectrographs using a triggered spark source. The 4d(8)-4d(7)(4f+ 6p) + 4p(5)4d(9) t ransitions of Sn VII, Sb VIII and Te IX were investigated. In the Sn V II spectrum 109 new lines were classified in the 152-192 Angstrom regi on and 34 new levels were established, in the Sb VIII spectrum 78 new lines were classified in the 138-158 Angstrom region and 21 new levels were established, and in the TeIX 76 new lines were classified in the 121-139 Angstrom region and 21 new levels were established. Strong co nfiguration interaction among the 4d(7)(np + mf), and 4p(5)4d(9) (n = 5, 6; m = 4, 5) configurations was observed. Least-squaresfitting (LSF ) parametric calculations involving configuration interaction were car ried out to interpret the observed spectra.