SPECTRUM AND ENERGY-LEVELS OF 6-TIMES-IONIZED MOLYBDENUM (MO-VII)

The spectrum of the kryptonlike ion Mo VII was observed from 140 to 2274 A with sliding-spark discharges on 10.7-m normal- and grazing-incidence spectrographs. Experimental energies were determined for all levels of the 4s24p6, 4s2, 4p54d, 4f, 5s, 5p, 5d, 5f, 5g, and 4s4p64d configurations. A few levels of the 4s24p44d2 configuration were also found. A total of 399 lines were classified as transitions between 86 observed levels. The observed configurations were theoretically interpreted. The energy parameters determined by least-squares fits to the observed levels are compared with Hartree-Fock calculations. A revised value of the ionization energy was obtained by using the energy of the 4p55g configuration together with an isoelectronically extrapolated value of the effective quantum number n*(5g). The adopted limit is 1013 340 ± 200 cm −1 (125.64 ± 0.02 eV). © 1990 Optical Society of America.