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O- ESD from O2 monolayers physisorbed on graphite: a surface mediated mechanism |
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| Authors: | K. B. K. Tang R. Azria Y. Le Coat M. Tronc R. E. Palmer |
| Affiliation: | 1. Laboratoire des Collisions Atomiques et Moléculaires, Université de Paris-Sud, Batiment 351, F-91405, Orsay, France 2. Cavendish Laboratory, University of Cambridge, Cambridge, CB3 2TT, UK 3. Nanoscale Physics Research Laboratory, School of Physics and Space Research, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK 4. Laboratoire de Chimie Physique, Université Pierre et Marie Curie, 11 rue Pierre et Marie Curie, F-75231, Paris Cedex 05, France |
| Abstract: | We report on electron-stimulated desorption (ESD) of O- ions from δ phase O2 physisorbed on graphite. A production of energetic O- ions is observed with an onset at about 13 eV. The measured onset of the yield of O+ ions is however found at about 20 eV. O- ions yields obtained at different ion kinetic energies and kinetic energy (KE) measurements lead us to postulate a substrate mediated ESD mechanism following direct electronic excitation of physisorbed O2. |
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