Abstract
Experimental and theoretical methods were used to study the formation of hollow atoms during the interaction of Ne 9+ projectiles with a surface of Al and C. To exhibit the static aspect of hollow atoms above and below a surface, results obtained from the Hartree-Fock and Density Functional method were applied for electron charge density plots. The dynamic properties of hollow atoms are revealed by means of a cascade model which includes the filling of inner shell orbitals via Auger transitions and collisional charge transfer. The theoretical results are compared with experiments using Auger spectroscopy. Improvement of the spectrometer efficiency allows for measurements of electrons at energies as low as a few eV. The Auger spectra, interpreted by the cascade model, yield information about the life time and the interaction region of the hollow atom within the first layers of the surface.
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