Abstract :
Polarized absorption spectra experiments were carried out to investigate the structural symmetries of color centers of PbWO4 crystals. It was found that the intensity of the electrical vector E⊥c of the radiation-induced 420 nm absorption band equals that of the E∥c, indicating the non-dichroic character of the band. Based on the analysis of the energy band structure and the crystal structure of PbWO4, the origin of the radiation-induced 420 nm absorption band was ascribed to the VF0 di-hole center.
