A Revision of the Analysis of the Fifth Spectrum of Molybdenum (Mo V)

Abstract

The spectrum of Mo V was observed in the wavelength region from 250 to 6000 Å, using a variety of spectrographs and light sources. The level system was revised and extended to include all but one of the levels of 4d2, 4d5s, 4d5d, 4d6s, 4d5p, 4d6p, 4d4f and 5s5p. Hartree-Fock calculations were made and also parametric least-squares calculations including configuration interaction. Scaling factors between Hartree-Fock and least-squares values for the interaction integrals were obtained and used for an isoelectronic comparison. The ionization potential was estimated to be 54.49 ± 0.02 eV.

Spectrum and energy levels of quadruply-ionized molybdenum (Mo V)

“…In comparing our present wavelengths with those of Cabeza et al [6], it is seen that many of the wavelengths are in very good agreement. Quite a few are identical.…”

“…We have now found new levels that replace the 5s5p 1 P 1 , 4d6p 3 P 0 , and 4d5d 1 S 0 levels of Cabeza et al [6]. Except for these three levels, we confirmed the analysis of Cabeza et al [6], and we consider this as the starting point for our present knowledge of this spectrum.…”

“…We have now found new levels that replace the 5s5p 1 P 1 , 4d6p 3 P 0 , and 4d5d 1 S 0 levels of Cabeza et al [6]. Except for these three levels, we confirmed the analysis of Cabeza et al [6], and we consider this as the starting point for our present knowledge of this spectrum. Additionally, we report 52 new energy levels of the 5s 2 , 5p 2 , 5s5d, 5s6s, 4d5f, and 4d5g configurations, which are practically complete, as well as about 75 levels of 4p 5 4d 3 .…”

“…All uncertainties are estimated at the level of one-standard deviation. In order to provide a unified description of this spectrum, we have included in table 1 the lines identified by Cabeza et al [6]. All wavelengths are from our present measurements.…”

“…In 1985 Tauheed et al [5] extended the level system to a number of higher configurations. These were only partially confirmed by the 1986 analysis of Cabeza et al [6], who classified about 400 lines representing transitions between the nearly complete 4d 2 , 4d5s, 4d5p, 4d5d, 4d4f, 5s5p, 4d6s, and 4d6p configurations. Much of the data for this analysis [6] consisted of spectrograms supplied by Kaufman of the National Institute of Standards and Technology (NIST) to the Instituto de Optica in Spain and of wavelengths for Mo V measured by Reader of NIST, supplied to Meijer of the Zeeman Laboratorium in The Netherlands in 1979.…”