The magnetic moment of the ${\mathrm{Cl}}^{36}$ nucleus was measured by observing the Zeeman splitting of the $F=2\mathrm{}\to 2$ line in the electric quadrupole hyperfine pattern of the molecule C${\mathrm{H}}_3$${\mathrm{Cl}}^{36}$ $J=0\mathrm{}\to 1$, $K=0\mathrm{}$ transitions). It was found to be 1.32±0.08 nuclear magnetons. The magnitude of the magnetic moment was measured by using a rectangularly cross-sectioned absorption cell with plane polarized microwave radiation, and observing the $\Delta M=\pm 1$ transitions. The sign of the magnetic moment was measured by using a circularly cross-sectioned absorption cell with circularly polarized microwave radiation. This allowed the $\Delta M=1\mathrm{}$ and the $\Delta M=-1\mathrm{}$ transitions to be observed separately. The magnetic field was calibrated by observing the Zeeman splitting of the spectrum of C${\mathrm{H}}_3$${\mathrm{Cl}}^{35}$. This value of magnetic moment indicates a nuclear configuration ${\left(d_{\frac{3}{2}}\right)}_N{\left(d_{\frac{3}{2}}\right)}_P$.

Measurements of the quadrupole spectrum without the Zeeman perturbation gave the following additional information: the spin of ${\mathrm{Cl}}^{36}$ was confirmed to be 2, the mass difference ratio $\frac{\left[m\right({\mathrm{Cl}}^{36})-m({\mathrm{Cl}}^{35}\left)\right]}{\left[m\right({\mathrm{Cl}}^{37})-m({\mathrm{Cl}}^{36}\left)\right]}$ was found to be 1.00168±0.04 percent, the molecular rotational constant of the C${\mathrm{H}}_3$${\mathrm{Cl}}^{36}$ molecule was found to be 13187.604±0.015 Mc/sec, and its quadrupole coupling constant to be -15.83±0.20 Mc/sec.

• Received 24 February 1955

DOI:https://doi.org/10.1103/PhysRev.98.1317