The Quadrupole Moments ofSb121andSb123

Abstract

An extension of the existing term analysis of the spectrum of Sb II has led to the reliable identification of lines which are known to exhibit well-resolved hfs patterns. Among the few such lines which reveal a simple pattern are the three transitions whose wavelengths in angstroms are 5057, 5895, and 6806. Based on the measurements of the hfs separations of these lines, it has been possible to arrive at values of the nuclear electric quadrupole moments of ${\mathrm{Sb}}^{123}$ and ${\mathrm{Sb}}^{121}$ from a study of the splitting of the $5s5p^3{}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}$, $5p6s{}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}$, and $5p6p{}_{}{}^3{}_{}{}^{}D_1^{}{}_{}{}^{}$ states. Utilizing the recent value of the quadrupole-moment ratio as determined by microwave techniques, corrections have been applied for the perturbing effects of unassigned nearby levels. The present calculations yield the following results for the quadrupole moments of the two isotopes: $Q_{121}=-1.3\mathrm{}\times {10}^{-24\mathrm{}} {\mathrm{cm}}^2, \mathrm{and} Q_{123}=-1.7\mathrm{}\times {10}^{-24\mathrm{}} {\mathrm{cm}}^2.$