The Hyperfine Structure of Lead
1932; American Institute of Physics; Volume: 40; Issue: 5 Linguagem: Inglês
10.1103/physrev.40.760
ISSN1536-6065
Autores Tópico(s)Chemistry and Stereochemistry Studies
ResumoThe hyperfine structure of several lines of Pb I and Pb II in the violet and ultraviolet regions has been determined. $\ensuremath{\lambda}\ensuremath{\lambda}4168$, 4062, 4058, 4019, 3739, 3683, 3671, 3639, 3572, 2873, 2833, 2823, 2802 of Pb I, and $\ensuremath{\lambda}\ensuremath{\lambda}4386$, 4245, 3786, 3016, 2948 of Pb II were found to have structure. $\ensuremath{\lambda}\ensuremath{\lambda}2663$, 2614, 2613, and 2577 of Pb I were observed and found to be simple. Exposures with uranium-lead showed that all of the above lines are single for ${\mathrm{Pb}}^{206}$. It was also found from the line patterns that there is a larger abundance of ${\mathrm{Pb}}^{207}$ than ${\mathrm{Pb}}^{208}$ in uranium-lead (Belgian Congo). The hyperfine splittings of $s^{3}P_{0.1}$ and $p^{3}P_{0,1,2}$ of ${\mathrm{Pb}}^{207}$ I were calculated. The center of gravity of the ${\mathrm{Pb}}^{207}$ terms and the single ${\mathrm{Pb}}^{206}$ and ${\mathrm{Pb}}^{208}$ terms for these levels were found to fall in the order of their masses. Much larger isotope displacements were observed for Pb II than for Pb I.Variations in the relative intensities of certain lines of Pb I with excitation conditions made it appear that there may be something wrong in the classification of some of the lines with initial levels, $d^{3}D_{1,2}$ and $d^{3}F_{2,3}$. A change of several of the line patterns was observed with a variation of voltage and temperature.
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