Abstract
We present energy loss data taken after grazing incidence scattering of H +, H 0, He 2+, He +, and He 0 off an Al(110) surface. The data is evaluated by means of a procedure that allows to extract surface electron density parameters. The obtained density parameters will be compared to those obtained from a potassium target. The advantage of using Al and K is that both can be described by a jellium model. In order to extract the electron density parameters we employ a method based on a description of the interaction via the force of friction. We find that the experimental data cannot be fitted using calculated bulk friction coefficients. Thus we suggest that the friction of light ions is different at the surface and in the bulk.
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