Spectroscopic analysis of the 4p4d configuration of KrVII

The spectrum of six times ionized krypton, (KrVII) has been observed in the 300-2100 Angstrom wavelength range. We propose 11 new energy level values for the 4p4d configuration and we adjusted the previously known energy leve l values for the 4s5p, 4s4f, 4s5s and 4s5d configurations. A total of 56 ne w lines in this spectra have been classified. The observed configurations w ere theoretically interpreted by means of Hartree-Fock relativistic, (HFR) calculations and least-squares fit of the energy parameters to the observed levels.