Hyperfine structures in the configuration 4f35d6s of the praseodymium atom

Abstract 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 4f 3 5d6s and for the upper levels (usually unclassified) are presented.