Isotope shifts and hyperfine structures of four transitions in W i have been measured as well as isotope shifts in Lu i by means of atomic-beam laser spectroscopy. Magnetic-dipole hyperfine constants A of ${}_{}{}^{183}{}_{}{}^{}\mathrm{W}$ are determined for the atomic states ${}_{}{}^7{}_{}{}^{}$${\mathit{D}}_1$, ${}_{}{}^7{}_{}{}^{}$${\mathit{F}}_1$, and ${}_{}{}^7{}_{}{}^{}$${\mathit{F}}_3$ of the 5${\mathit{d}}^4$6s6p configuration. The nuclear parameters λ and δ〈${\mathit{r}}^2$〉 are derived for W stable isotopes. J dependences of the isotope shifts are observed for the ${}_{}{}^2{}_{}{}^{}$D term of the 5d6${\mathit{s}}^2$ configuration in Lu i and the ${}_{}{}^5{}_{}{}^{}$D term of the 5${\mathit{d}}^4$6${\mathit{s}}^2$ configuration in W i. Parameters ${\mathit{z}}_{5\mathit{d}}$ of the crossed-second-order effects are derived for the Lu i 5d6${\mathit{s}}^2$ and W i 5${\mathit{d}}^4$6${\mathit{s}}^2$ configurations, and ${\mathit{z}}_{5\mathit{d}}$/λ is found to be 411(26) MHz/${\mathrm{fm}}^2$ for W. A systematic behavior of the normalized parameter ${\mathit{z}}_{\mathit{n}\mathit{l}}$/λ${\mathrm{\zeta }}_{\mathit{n}\mathit{l}}$ is discussed.

• Received 10 September 1993

DOI:https://doi.org/10.1103/PhysRevA.49.762