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Calculated values of the spin-orbit splittings from previously measured valence-band splittings in single crystals of CdS and CdSe at liquid-helium temperatures are 0.065 and 0.418 eV, respectively. In this investigation, spin-orbit splittings have been determined for solid solutions of CdS :Se single crystals from transmission measurements on thin platelets at 4.2°K. The single-crystal platelets of approximately 1 jx thickness were grown from the vapor phase. Measurements which have been made on seven intermediate compositions indicate that the spin-orbit splittings vary in an approximately linear manner with composition. The average deviation from linearity is approximately 10% greater than the experimental uncertainties. It is believed that slight deviations from linearity may be due to (1) the deviation of CdS from the ideal c/a ratio in the wurtzite structure and (2) the greater contribution of ionic binding in CdS.

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A Faraday rotation experiment is described for laser beams of two wavelengths in moderate magnetic fields, using flint glasses of large rotary birefringence and (liquid) carbon disulfide. Results show a linear relation between angle of rotation and field strength, and indicate a strong dependence on wavelength, attributable to the dispersion, which is determined from a measurement of the Verdet constant. The theoretical treatment and experimental technique are recommended for the advanced undergraduate laboratory.