A series of experiments has been performed to determine the hyperfine structure in the metastable 4d55s 5D1,2,3,4 states of Mo I by means of the laser radiofrequency double-resonance technique. Furthermore, hyperfine structure splittings and isotope shifts in seven optical transitions connecting the 4d55s 5D0,1,2,3,4 and the 4d45s5p 5P1,2,3 states were resolved with the high-resolution laser spectroscopy technique. Radial hyperfine structure parameters are deduced for the effective operator within the 5D states using the configuration 4d45s2, 4d55s and 4d6 as a model space. The isotope shifts are also discussed, utilizing an effective operator, with particular emphasis on the J dependence.
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