The molecular-beam electric-resonance method has been used to determine the ${}_{}{}^{79}{}_{}{}^{}\mathrm{Br}$ to ${}_{}{}^{81}{}_{}{}^{}\mathrm{Br}$ nuclear quadrupole moment ratio in molecular LiBr. The observed ratio of 1.197 056(6) agrees with one obtained elsewhere for atomic bromine, thus indicating no observable nuclear polarizability effect.

• Received 12 August 1968

DOI:https://doi.org/10.1103/PhysRev.178.205