Abstract
The low-temperature time-resolved photoluminescent spectroscopy with synchrotron excitation was used to analyse samples of polycrystalline Be 2 GeO 4 after exposure to fast neutrons ( E ∼ 1 MeV ; Φ = 4.5 × 10 17 cm - 2 ). Luminescence spectra of the test samples contained the band at 1.7 eV arising from the radiative relaxation of neutron-induced molecular O 2 - ions. Luminescence of these defects was efficiently excited by photons with an energy of 4.7 and 5.2 eV. Contours of the corresponding bands in the photoluminescence and excitation spectra of O 2 - centres had a characteristic fine structure, which reflected the presence of intracentre interactions. Average vibration frequencies of O 2 - ions in the Be 2 GeO 4 lattice were determined. Potential energy curves were calculated using the Morse potential for the ground and excited states of molecular O 2 - -ions in Be 2 GeO 4 .
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