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
Format:	Artikel
Sprache:	eng
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Zusammenfassung:	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.
ISSN:	1012-0386 1662-9507 1662-9507
DOI:	10.4028/www.scientific.net/DDF.373.324