Quadrupole Spectrum of BiCl3

Pure nuclear quadrupole resonance absorptions were observed for ${\mathrm{Bi}}^{209}$, ${\mathrm{Cl}}^{35}$, and ${\mathrm{Cl}}^{37}$ nuclei in polycrystalline Bi${\mathrm{Cl}}_3$ at both room and liquid air temperatures. Line assignments and the evaluation of the electric field gradient asymmetry parameter $\eta$ allow the following coupling constants to be calculated: ${\mathrm{}\left|\mathrm{eQq}\right|\mathrm{}}_{\mathrm{Bi}}=318.76\mathrm{}$ Mc/sec for $\eta =0.555\mathrm{}$; ${\mathrm{}\left|\mathrm{eQq}\right|\mathrm{}}_{{\mathrm{Cl}}^{35}}=30.196\mathrm{}$ Mc/sec, 38.310 Mc/sec. Two "forbidden" $\left|\Delta m^{\prime }\right|=2\mathrm{}$ transitions were observed. A brief discussion of the data in connection with chemical bonding in the solid is given.