Photostimulated detection of radiation defects produced by VUV light in BaF2

Photostimulated detection of defect formation in BaF2 under irradiation of synchrotron radiation

“…We performed laser‐induced luminescence spectroscopy, in which defects are probed by radiative recombination of optically released electrons and/or holes from the defects 16. This method is a very sensitive tool to detect radiation damages generated in the samples, as shown in the preliminary report 17. Our experimental results show that VUV irradiation produces lattice defects such as F and V K centres in BaF 2 and that the production efficiency depends significantly on the VUV photon energy.…”

“…The spectra are not corrected for the spectral response of the detecting system. The photon energy of SR is 19.5 eV, which induces interband excitations of the core level, i.e., excitations from the Ba 2+ ‐5p core band to the conduction band 17. The photon energy of the laser, 1.6 eV, is far below the band‐gap energy of BaF 2 , E g (11.0 eV) 18.…”

Irradiation-catalysed degradation of methyl orange using BaF 2 –TiO 2 nanocomposite catalysts prepared by a sol–gel method

“…The literature reveals that when BaF 2 is bombarded with high-energy ions, the electrons on the Ba 2+ (5p) band are excited to the conduction band to leave the holes, and the electrons on the F − (2p) valence band are transitioned to Ba (5p), which produces RL [17]. Therefore, BaF 2 can effectively absorb high-energy radiation and emit ultraviolet light of 220 and 315 nm, which is then used to excite TiO 2 for photocatalysis to produce more active particles [18][19][20].…”