Revised and extended analyses of the Pd-like ion spectra SbVI, TeVII and IVIII

The 4d(9)5l -4d(9)5l transitions in the Pd-like ion spectra Sb VI,Te VII an d I VIII have been reinvestigated in the 400 - 900 Angstrom wavelength regi on using vacuum spark sources. In Sb VI and Te VII, the previous analyses o f the 4d(9)5s - 4d(9)5p and 4d95p - 4d(9)5d transitions have been extended by respectively six and twenty-six newly classified lines. An additional fo rty-four and forty-nine lines have been identified as 4d95d - 4d(9)5f trans itions leading to the determination of the 4d95f levels in Sb VI and Te VII . For I VIII, the previously identified 4d95s - 4d95p transitions have been remeasured and seven new lines were added. The 4d95s and 4d95p level energ ies have been revised. An additional forty-seven lines have been identified as 4d95p - 4d95d transitions leading to the determination of the 4d95d lev els. Resonance lines have been remeasured for Te VII and I VIII in the graz ing incidence region. The 4d95d (1)So levels, of crucial interest in the de velopment of X-W lasers, have been established for the first time in all th ree spectra studied.