Hyperfine structures in the configuration 4f5d6s of the praseodymium atom

Results of hyperfine structure studies of the praseodymium atom are presented. Hyperfine spectra were obtained by the method of laser induced fluorescence on an atomic beam. Values of the hyperfine structure constants of the lower levels belonging to the configuration 4f³5d6s and for the upper levels (usually unclassified) are presented.