Positron-electron annihilation induced ion desorption

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Positron-stimulated desorption of ions from a TiO2(110) surface has been investigated. Desorbed O+ ions were detected in coincidence with the emission of annihilation γ-rays. The energy dependence of the ion yields shows that the O+ ions were detected at much lower energies than the previously reported threshold energy for electron impact desorption corresponding to the excitation energy of Ti(3p) core electrons. These results provide strong evidence that core-hole creation by positron annihilation with electrons in the TiO2 core levels leads to the desorption of O+ ions.