Hyperfine Structure of Singly Ionized Lead

Some one hundred and thirty lines of Pb II were observed with Lummer-Gehrcke plates and Fabry-Perot interferometers from 2300 to 10,000A. The isotope shifts between ${\mathrm{Pb}}^{208}$ and ${\mathrm{Pb}}^{206}$, and the h.f.s. splitting of ${\mathrm{Pb}}^{207}$ were computed from the h.f.s. measurements of these lines for all of the levels of Pb II, classified by Earls and Sawyer, with the exception of $6s^{2}6p^2{P}_{\frac{1}{2},\frac{3}{2}}$ and $6s6p^2{}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}$. Parameters were obtained for equations derived by Breit and Wills for finding the h.f.s. constants, $a^{\prime }$, $a^{\prime \prime }$, $a^{\prime \prime \prime }$, and $a\left(s\right)\mathrm{}$, of the $6s6p^2$ configuration in intermediate coupling.