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 $|\frac{{\ensuremath{\mu}}_{I}({\mathrm{Pb}}^{207})}{{\ensuremath{\mu}}_{I}({\mathrm{Hg}}^{199})}|=1.14960(4)$ and ${|{\ensuremath{\mu}}_{I}({\mathrm{Pb}}^{207})|}_{\mathrm{uncorrected}}=0.57235(2){\ensuremath{\mu}}_{N}$. The large (2%) difference between the accepted NMR value and the previously reported optical-pumping value is thus confirmed.