Conduction-band states ofTiS2studied by means of polarized x-ray absorption

Abstract

We studied the polarization dependence of the Ti K threshold in the layered compound ${\mathrm{TiS}}_2$. We found that the weak structures at about 4967 eV associated with the Ti empty d states are dipole allowed for E⊥c, and that the following sharp, strong peak at 4975.7 eV is isotropic. With the multiple-scattering method, we calculated the projected densities of states that reproduce our polarization-dependent spectra, except for the d structures and the sharp peak at 4975.7 eV. The former can be interpreted with consideration of the ${\mathrm{TiS}}_2$ band structure. For the latter we suggest a bound state or resonance of the excited crystal.