A STUDY OF THE 5D(2), 5D6P AND 5D5F CONFIGURATIONS OF PT-IX

The spectrum of eight-times ionized platinum was photographed in the 1 00-400 Angstrom region using a 2-m and a IO-m grazing incidence spectr ographs. The 5d(2)-(5d6p + 5d5f) transitions of Pt IX were analysed an d 116 lines have been classified in the 216-345 Angstrom region. All n ine levels of the 5d(2) configuration, all twelve levels of the 5d6p c onfiguration and eighteen of twenty levels of the 5d5f configuration h ave been established. Hartree-Fock and least-squares fitted parametric calculations were carried out and they interpret the observed level s tructure quite satisfactorily.