Ion Desorption Caused by Positron–Electron Pair Annihilation

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Other Title
  • 陽電子–電子対消滅による固体表面からのイオン脱離
  • ヨウデンシ-デンシ ツイショウメツ ニ ヨル コタイ ヒョウメン カラ ノ イオン ダツリ

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Abstract

<p>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 yield of e+SD was one order of magnitude higher than the yield of ESD at an incident energy of 500 eV. Furthermore, e+SD of O+ ions caused even below the ESD threshold and 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 observed the ion desorption from water chemisorbed on the TiO2 surface and found that the desorption of specific ions was enhanced in e+SD. This finding corroborates our conclusion that annihilation-site selectivity of positrons results in site-selective ion desorption.</p>

Journal

  • Butsuri

    Butsuri 76 (11), 723-728, 2021-11-05

    The Physical Society of Japan

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