Ion kinetic energy distribution of electron stimulated desorption of O+ from TiO2(110)–SO2

Autor:	M. C. Torquemada, J.L. de Segovia
Rok vydání:	1994
Předmět:	Adsorption Chemistry Annealing (metallurgy) Desorption Ion yield Analytical chemistry Surfaces and Interfaces Electron Condensed Matter Physics Kinetic energy Excitation Surfaces Coatings and Films Ion
Zdroj:	Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 12:2318-2322
ISSN:	1520-8559 0734-2101
DOI:	10.1116/1.579206
Popis:	In this paper we describe an investigation of the ion kinetic energy distribution (IED) with electron stimulated desorption of O+ from SO2 adsorbed on TiO2(110) at 153 K. The IED at the clean surface shows a bimodal structure with two well differentiated peaks, at most probable kinetic energies of 4 and 7.2 eV. The SO2 adsorption produces a dramatic change in the IED. There is a new peak at 2 eV kinetic energy, and the peaks at 4 and 7.2 eV vary in intensity according to the electron incident energy. The O+ ion yield curve shows, in addition to the onset at the Ti 3p core level at 35 eV electron energy, a second threshold at 160 eV corresponding to S 2p core level excitation. Changes in the IED curves following annealing of the SO2 layer at room temperature and 400 K as well as an adsorption model are also presented.
Databáze:	OpenAIRE
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