FORMATION AND INTERACTION OF HOLLOW NEON ATOMS AT AN ALUMINUM SURFACE

Theoretical and experimental methods were used to study the interaction of Ne 9+ ions with an Al surface. Theoretical models were applied to visualize the shape and dimension of hollow neon atoms formed above and below the surface. Atomic Hartree-Fock calculations were performed to determine the large hollow atoms produced with electrons in high Rydberg levels above the surface. Inside the first surface layers hollow atoms were evaluated by means of a Density Functional theory including non-linear screening effects. The time-dependent decay sequence of a hollow atom was determined from a cascade model that describes the filling of the L shell. The cascade model yields information about the life time and the interaction region of the hollow atom within the first layers of the surface. Experimental results obtained by means of Auger spectroscopy are used to verify the results of the model predictions.

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