Radiation-induced luminescence from TiO by 10 keV O, N and Ar irradiations

Kitazawa, Sin-iti; Ishiyama, Shintaro; Saito, Yuichi; Yamamoto, Shunya; Asano, Masaharu

Radiation-induced luminescence (RIL) produced by 10 keV O+, N+ and Ar ion irradiation at room temperature has been used to study energy transfer in titanium dioxide (TiO) targets. Visible bands at 2.0 and 2.6 eV are due to crystalline defect. A UV band at 3.9 eV is originated from radiation transitions between Ti 3d and O 2s states in the TiO crystal. These bands were analysed by fittings of Lorentz curves. The ratios of the band intensity were affected by the differences of the projectiles. The UV bands were hardly affected by differences of targets. It suggests that the excitations were not mainly produced by transitions from the grand state to excited states but by cascade radiations from higher excited states. The difference in anatase and rutile target was hardly observed in the observed spectra. From these results, it is possible to know a part of relaxation process from higher excited states in TiO.