SIGNATURE OF METASTABLE ELECTRONS IN HIGHLY CHARGED ION-SURFACE INTERACTIONS

1998 
We present autoionization spectra of metastable ${\mathrm{Ar}}^{8+}$ and ${\mathrm{C}}^{4+},{\mathrm{N}}^{5+},{\mathrm{O}}^{6+},$ and ${\mathrm{Ne}}^{8+}$ scattering off an Al(111) surface with incident energies down to 5 eV. The unprecedented statistical quality of the experimental data permits the observation of structures originating from the metastable projectiles compared to corresponding ground-state configurations. Analyzing the peak positions for different projectile species and velocities we demonstrate that the peak must be ascribed to an above-surface transition with the participation of the metastable state.
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