Electron stimulated desorption of charged particles from acetate covered rutile TiO[sub 2](110)

Guo, Q.; Williams, E. M.
February 2000
AIP Conference Proceedings;2000, Vol. 500 Issue 1, p392
Academic Journal
The interaction of low energy electrons with acetate adsorbed on the (110) surfaces of rutile TiO[sub 2] has been studied using electron stimulated desorption ion angular distribution, low energy electron diffraction and scanning tunnelling microscopy. The adsorption of acetic acid at room temperature is dissociative, and produces a layer of carboxylate species and surface hydroxyl species in an ordered array. Irradiation of the adsorbate covered TiO[sub 2](110) surface causes the dissociation of the surface species, leading to the desorption of a range of charged particles. The dominant desorption products are the H[sup +] ions. The H[sup +] ESD ion angular distribution can be resolved into two contributions: those ions desorbed from hydrogen atoms bonded at the oxide substrate, and those desorbed via the rupture of the C-H bonds of the acetate species. The geometry of the ESDIAD pattern led us to propose that the carboxylate species is bound to the Ti[sup 4+] ions with the molecular axis perpendicular to the surface. © 2000 American Institute of Physics.


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