The Effect of Hyperfine Structure on the Polarization of Cadmium Resonance Radiation

The polarization of cadmium resonance radiation ($\lambda 3261$) has been calculated assuming that cadmium is composed of two kinds of isotopes having a nuclear $\mathrm{moment}i=0\mathrm{}$ and $i=\frac{1}{2}$ respectively. The ratio of the isotopes of nuclear moment $i=\frac{1}{2} \mathrm{to} i=0\mathrm{}$ was taken from the hyperfine structure data on cadmium as measured by Schüler and Keyston. The percentage polarization to be expected for "broad" and "narrow" line excitation and for different orientations of electric vector and magnetic field are given and comparison is made with Soleillet's experiments.