Ion Desorption from TiO2(110) by Low Energy Positron Impact

Ion Desorption from TiO2(110) by Low Energy Positron Impact

We have observed positron-stimulated ion desorption from a TiO2(110) surface. H+ and O+ ions were desorbed at incident positron energies above the desorption thresholds for electron impact. However, only O+ ions were detected at energies below those thresholds. These results suggest that by surface...

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Veröffentlicht in:Diffusion and defect data. Solid state data. Pt. A, Defect and diffusion forum Defect and diffusion forum, 2017-03, Vol.373, p.324-327
Hauptverfasser: Hirayama, Takato, Tachibana, Takayuki, Nagashima, Yasuyuki, Nagira, Masaru, Chiari, Luca
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container_title Diffusion and defect data. Solid state data. Pt. A, Defect and diffusion forum
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creator Hirayama, Takato
Tachibana, Takayuki
Nagashima, Yasuyuki
Nagira, Masaru
Chiari, Luca
description We have observed positron-stimulated ion desorption from a TiO2(110) surface. H+ and O+ ions were desorbed at incident positron energies above the desorption thresholds for electron impact. However, only O+ ions were detected at energies below those thresholds. These results suggest that by surface ionization positron annihilation as well as by positron impact leads to the O+ ion desorption. By contrast, it is likely that the H+ ions are not desorbed by positron annihilation, but rather by impact ionization.
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