Nine-times ionized cerium spectrum: Ce X

The spectrum of cerium was recorded in 100-1240 Angstrom regions on a variety of normal and grazing incidence spectrographs using a conventional vacuum triggered spark and a laser produced plasma source. The tenth spectrum of cerium was investigated for the first time. Thirty-four lines were classified in Ce X in the 225-732 Angstrom region. Eight levels belonging to the odd parity configurations and seventeen levels of the even parity configurations have been established. The least-squares-fitted parametric calculations and Hartree-Fock calculations were carried out and they interpret the spectrum satisfactorily.