Abstract
Absorption, reflection, excitation and polarization spectra of CdWO 4 crystals have been studied in the region 3.5–30 eV in order to distinguish between the excitonic and electron–hole processes in the vicinity of the band-gap. An energy gap of 5 eV has been determined from the Urbach tail study at 100–300 K. Excitonic processes have been shown to dominate at lower energies. A new fast emission band peaking at 3.6 eV has been found under pulsed electron (300 keV, 3 ns) excitation and presumably ascribed to the metastable oxyanionic exciton.
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