The spin-orbit splitting 60 and 6, of electron energy levels at the I' and A points are obtained for the'alloys Mg"Zn& "Te in the cubic range x & 0.5 from wavelength-modulation reflectivity measurements at both T = 300 K. and T = 82 K. Within experimental scattering, 50 and 5& do not depend on x and T. These data are explained by semiempirical developments on the basis of the well-known time-sharing relation following the Berolo-Woolley analysis. An evaluation of the multiplicative factor in this relation is made for b, o by introducing the metallicities of end compounds. In addition, we give a new set of a parameters for the calculation of h, o in II -VI binary compounds from the time-sharing relation. Finally, an estimation is made of h, o and 5, for MgTe: 5() -0.95 eV and 6, -0.6 eV. The 2/3 law is roughly observed for end compounds and ternary alloys.
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