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Spectrum and Energy Levels of Quadruply-Ionized Molybdenum (Mo V)



Joseph Reader, Tauheed Ahmad


The spectrum of quadruply-ionized molybdenum Mo V was observed from 200 Å to 4700 Å with sliding spark discharges on 10.7-m normal- and grazing-incidence spectrographs. The existing analyses of this spectrum [Tauheed A et al. 1985 Phys. Scr. 31 369; Cabeza M I et al. 1986 Phys. Scr. 34, 223] was extended to include the 5s2, 5p2, 5s5d, 5s6s, 4d5f, and 4d5g configurations as well as the missing 3H6 level of 4d4f and about 75 levels of the core-excited configuration 4p54d3. The values of 4d5d 1S0, 5s5p 1P1, and 4d6p 3P0 were revised. There are now about 900 lines classified as transitions between 66 even parity and 191 odd parity energy levels. Of these, 546 lines and 130 levels are new. From the optimized energy level values, Ritz-type wavelengths for about 380 lines with uncertainties varying from 0.0003 Å to 0.002 Å were determined. The observed configurations were theoretically interpreted by means of Hartree-Fock calculations and least-squares fits of the energy parameters to the observed levels. The fitted parameters were used to calculate oscillator strengths for all classified lines. A few unclassified lines and undesignated levels are also given. An improved value for the ionization energy was obtained by combining the observed energy of the 4d5g configuration with an ab initio calculation of its term value. The adopted value is 438900±150 cm-1 (54.417±0.0119 eV).
Journal of Physics B-Atomic Molecular and Optical Physics


spectrum, molybdenum, four-times ionized, ultraviolet, energy levels, transition probabilities, ionization energy


Reader, J. and Ahmad, T. (2015), Spectrum and Energy Levels of Quadruply-Ionized Molybdenum (Mo V), Journal of Physics B-Atomic Molecular and Optical Physics, [online], (Accessed April 18, 2024)
Created May 28, 2015, Updated July 3, 2023