Abstract
Isotope shifts of 9 transitions from the ground and metastable states in Yb I were measured for 7 stable isotopes with A =168-176 by means of atomic-beam laser spectroscopy. Hyperfine constants A and B of 12 levels for 171 Yb and 173 Yb were determined. Reliable values of nuclear parameters λ were obtained and changes in mean square nuclear charge radii δ< r 2 > were deduced using both the two-parameter model and the numerical calculation. Deformations for Yb stable isotopes were discussed. Hyperfine constants A and B were analyzed with the effective operator procedure and the single-electron hyperfine parameters of 6 s and 6 d electrons were derived for the Yb I 4 f 14 6 s 6 d configuration. For the 3 D J and 1 D 2 states of 4 f 14 6 s 6 d , J and term dependences of isotope shifts were obtained and the parameters of the crossed-second-order effect were derived to be z 6 d /λ=18(6) MHz/fm 2 and g 2 (6 s , 6 d )/λ=-1120(60) MHz/fm 2 .
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