STUDY OF THE 4S4P4D AND THE 4S4P5S CONFIGURATIONS OF KR-VI

The spectrum of Kr VI was recorded in the 23-254-nm-wavelength range, resulting in 109 new line classifications. From these data we were able to identify 22 new energy levels belonging to the 4s4p4d and the 4s4p5s configurations. The levels belonging to the 4s(2)5p and the 4s(2)4f configurations and the levels 4s4p(22)S(1/2) and 4p(32)P(1/2) have new energy values proposed. The results are supported by isoelectronic extrapolation and multiconfiguration Hartree-Fock calculations with relativistic corrections. The experimental data were obtained from a capillary-discharge tube and theta-pinch light sources.