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Kinetic electron emission in the interactions of slow ions with MgO surfaces |
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| Authors: | P. Riccardi, P. Barone, A. Bonanno, A. Oliva, P. Vetr , M. Ishimoto,R.A. Baragiola |
| Affiliation: | aLaboratorio IIS, Dipartimento di Fisica, Universitá della Calabria, and INFM Unità di Cosenza, 87036 Arcavacata di Rende, Cosenza, Italy bLaboratory for Atomic and Surface Physics, University of Virginia, Charlottesville, VA 22904, USA cFujitsu Laboratories Ltd., Akashi, Hyougo 674-8555, Japan |
| Abstract: | We report experimental energy distributions and yields of electrons emitted from MgO surfaces under the impact of slow noble gas and sodium singly charged ions at varying incident energies. At impact energies below 1 keV, electron spectra are nearly independent of ion type and energy. A tail of high-energy electrons is observed to grow at higher impact energies. The results are explained in terms of promotion of oxygen-2p electrons during binary projectile-oxygen collisions populating continuum and excitonic states. Excitons can significantly contribute to electron emission due to the negative electron affinity of the surface. |
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