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Interpretation of the 5p3, 5s5p5d and 5s5p6s configurations of trebly ionized tellurium (Te IV)

The spectrum of tellurium was photographed on a 3 m normal incidence spectrograph in the 300-2100 Å wavelength region using a triggered spark source. Three configurations, namely 5p3, 5s5p5d and 5s5p6s, of trebly ionized tellurium (Te IV), all involving two-electron excitations, were investigated. Seven out of ten levels reported previously were confirmed, some with a change of configuration assignment, the J-value of one level was changed from (3/2) to (5/2) and two levels were rejected. The new observations have resulted in establishing 35 out of 36 energy levels belonging to these three configurations. Least-squares fitted and Hartree-Fock calculations involving multi-configuration interactions were carried out to interpret the observed spectrum. 155 new lines have been classified in the Te IV spectrum.