A study of the spectrum of natural dysprosium with the laser-atomic-beam technique. I. Isotope shifts

A high resolution study of 31 transitions in dysprosium in the wavelength regions 435-470 nm and 560-670 nm has been performed using CW dye lasers and a collimated atomic beam. Transitions from the 5 I 8 ground state as well as from the metastable states at 4134 cm -1 ( 5 I 7 ) 7050 cm -1 ( 5 I 6 ) of the 4f 10 6s 2 5 I multiplet were studied. The results of isotope shift measurements on transitions to the excited-state configurations 4f 10 6s6p, 4f 9 6s 2 5d, 4f 9 6s5d 2 are presented and values for the specific mass shift and atomic factor of the field shift for the various configurations are evaluated.