Reanalysis of the even configurations system of atomic niobium

A multiconfiguration parametric calculation on the basis of 14 even configurations have been performed by taking into account the second-order of the perturbation theory. Satisfactory consistency of the values of experimental and calculated energy levels, Landé gJ factors and hyperfine structure constants was found in most cases. New experimental data, recently published, allowed to obtain more reliable wavefunctions and to predict the energy levels values and the hyperfine structure constants, if no experimental values are available.