Magnetic Circular Dichroism of the α and β Bands in KI

抄録

Magnetic circular dichroism (abbreviated as MCD) spectra of the α and β bands in KI are studied. The band shape of MCD of the α band resembles the derivative curve of the absorption band, while that of the β band resembles the absorption band itself. These facts imply that the β center is diamagnetic and the β center is paramagnetic, and that each of the observed bands corresponds to the lowest excited state split by the spin-orbit interaction. From the magnitudes of the MCD and absorption bands the orbital g-value of the valence hole in the perturbed excitons is found to be 0.7∼0.8. The reduction of the orbital g-value from unity is interpreted as the effect of the intermixing of the three hole functions around the lattice defects.