Polarization of Pb Vapor. II. Disorientation of thePb207Ground State andμI(Pb207)μI(Hg199)

Abstract

Optical pumping in the ${}_{}{}^3{}_{}{}^{}P_0^{}{}_{}{}^{}$ ground state of ${\mathrm{Pb}}^{207}$ is studied in detail. Pumping and nutation transient signals are used to investigate relaxation phenomena and to place upper limits on buffer-gas disorientation cross sections. ${\mathrm{Hg}}^{199}$ has been optically pumped in the same cell yielding $\left|\frac{{\mu }_I\left({\mathrm{Pb}}^{207}\right)}{{\mu }_I\left({\mathrm{Hg}}^{199}\right)}\right|=1.14960\mathrm{}\mathrm{}\left(4\right)\mathrm{}$ and ${\left|{\mu }_I\right({\mathrm{Pb}}^{207}\left)\right|}_{\mathrm{uncorrected}}=0.57235\mathrm{}\mathrm{}\left(2\right)\mathrm{}{\mu }_N$. The large (2%) difference between the accepted NMR value and the previously reported optical-pumping value is thus confirmed.