Efficient and surface site-selective ion desorption by positron annihilation

Abstract We compared positron- and electron-stimulated desorption (e+SD and ESD) of positive ions from a TiO2(110) surface. Although desorption of O+ ions was observed in both experiments, the desorption efficiency caused by positron bombardment was larger by one order of magnitude than that caused...

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Autores principales:	Takayuki Tachibana, Takashi Yamashita, Masaru Nagira, Hisakuni Yabuki, Yasuyuki Nagashima
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9de7317fdc0c46b995a30af54af57811
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spelling	oai:doaj.org-article:9de7317fdc0c46b995a30af54af578112021-12-02T16:08:14ZEfficient and surface site-selective ion desorption by positron annihilation10.1038/s41598-018-25506-52045-2322https://doaj.org/article/9de7317fdc0c46b995a30af54af578112018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25506-5https://doaj.org/toc/2045-2322Abstract We compared positron- and electron-stimulated desorption (e+SD and ESD) of positive ions from a TiO2(110) surface. Although desorption of O+ ions was observed in both experiments, the desorption efficiency caused by positron bombardment was larger by one order of magnitude than that caused by electron bombardment at an incident energy of 500 eV. e+SD of O+ ions remained highly efficient with incident positron energies between 10 eV and 600 eV. The results indicate that e+SD of O+ ions is predominantly caused by pair annihilation of surface-trapped positrons with inner-shell electrons. We also tested e+SD from water chemisorbed on the TiO2 surface and found that the desorption of specific ions was enhanced by positron annihilation, above the ion yield with electron bombardment. This finding corroborates our conclusion that annihilation-site selectivity of positrons results in site-selective ion desorption from a bombarded surface.Takayuki TachibanaTakashi YamashitaMasaru NagiraHisakuni YabukiYasuyuki NagashimaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-7 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Takayuki Tachibana Takashi Yamashita Masaru Nagira Hisakuni Yabuki Yasuyuki Nagashima Efficient and surface site-selective ion desorption by positron annihilation
description	Abstract We compared positron- and electron-stimulated desorption (e+SD and ESD) of positive ions from a TiO2(110) surface. Although desorption of O+ ions was observed in both experiments, the desorption efficiency caused by positron bombardment was larger by one order of magnitude than that caused by electron bombardment at an incident energy of 500 eV. e+SD of O+ ions remained highly efficient with incident positron energies between 10 eV and 600 eV. The results indicate that e+SD of O+ ions is predominantly caused by pair annihilation of surface-trapped positrons with inner-shell electrons. We also tested e+SD from water chemisorbed on the TiO2 surface and found that the desorption of specific ions was enhanced by positron annihilation, above the ion yield with electron bombardment. This finding corroborates our conclusion that annihilation-site selectivity of positrons results in site-selective ion desorption from a bombarded surface.
format	article
author	Takayuki Tachibana Takashi Yamashita Masaru Nagira Hisakuni Yabuki Yasuyuki Nagashima
author_facet	Takayuki Tachibana Takashi Yamashita Masaru Nagira Hisakuni Yabuki Yasuyuki Nagashima
author_sort	Takayuki Tachibana
title	Efficient and surface site-selective ion desorption by positron annihilation
title_short	Efficient and surface site-selective ion desorption by positron annihilation
title_full	Efficient and surface site-selective ion desorption by positron annihilation
title_fullStr	Efficient and surface site-selective ion desorption by positron annihilation
title_full_unstemmed	Efficient and surface site-selective ion desorption by positron annihilation
title_sort	efficient and surface site-selective ion desorption by positron annihilation
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/9de7317fdc0c46b995a30af54af57811
work_keys_str_mv	AT takayukitachibana efficientandsurfacesiteselectiveiondesorptionbypositronannihilation AT takashiyamashita efficientandsurfacesiteselectiveiondesorptionbypositronannihilation AT masarunagira efficientandsurfacesiteselectiveiondesorptionbypositronannihilation AT hisakuniyabuki efficientandsurfacesiteselectiveiondesorptionbypositronannihilation AT yasuyukinagashima efficientandsurfacesiteselectiveiondesorptionbypositronannihilation
_version_	1718384547100360704

Efficient and surface site-selective ion desorption by positron annihilation

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