Nine-times ionized cerium spectrum: Ce X

The spectrum of cerium was recorded in 100-1240 Angstrom regions on a varie ty of normal and grazing incidence spectrographs using a conventional vacuu m triggered spark and a laser produced plasma source. The tenth spectrum of cerium was investigated for the first time. Thirty-four lines were classif ied in Ce X in the 225-732 Angstrom region. Eight levels belonging to the o dd parity configurations and seventeen levels of the even parity configurat ions have been established. The least-squares-fitted parametric calculation s and Hartree-Fock calculations were carried out and they interpret the spe ctrum satisfactorily.