Hyperfine Structure of the 9161-cm−1D522State ofAu197and the Nuclear Electric-Quadrupole Moment

Abstract

The hfs of the $5d^{9}6s^2{}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{}$ metastable atomic state at 9161 ${\mathrm{cm}}^{-1\mathrm{}}$ in ${\mathrm{Au}}^{197}$ has been studied by the atomic-beam magnetic-resonance technique. The results, in conventional notation, are $g_J=1.20000\mathrm{}\left(2\right)\mathrm{}$, $A=+80.236\mathrm{}\left(3\right)\mathrm{}$ Mc/sec, $B=-1049.781\mathrm{}\left(11\right)\mathrm{}$ Mc/sec, and $C=+0.0004\mathrm{}\left(4\right)\mathrm{}$ Mc/sec. A detailed comparison of these results with those of Blachman and Lurio on the ${}_{}{}^2{}_{}{}^{}D_{\frac{3}{2}}^{}{}_{}{}^{}$ member of the same term indicates that configuration interaction is very small in the ${}_{}{}^2{}_{}{}^{}D$ term. The nuclear electric-quadrupole moment is calculated to be $Q\left({\mathrm{Au}}^{197}\right)=+0.59\mathrm{}\pm 0.12$ b.