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The pressure behavior of the absorption edge of PbWO4 was studied up to 15.3GPa. It red-shifts at -71 meV/GPa below 6.1 GPa, but at 6.3 GPa the band-gapcollapses from 3.5 eV to 2.75 eV. From 6.3 GPa to 11.1 GPa, the absorption edgemoves with a pressure coefficient of -98 meV/GPa, undergoing additional changesat 12.2 GPa. The results are discussed in terms of the electronic structure ofPbWO4 which attribute the behavior of the band-gap to changes in the localatomic structure. The changes observed at 6.3 GPa and 12.2 GPa are attributedto phase transitions.Comment: 14 pages, 3 figure

Effects of high pressure on the optical absorption spectrum of scintillating PbWO4 crystals