Abstract
The electronic structure of a clean Al surface is investigated by using positron annihilation characteristics. The electronic properties of metal surface are computed self-consistently within the jellium model and the resulting surface parameters are found to be in reasonable agreement with experimental data. The positron annihilation characteristics are calculated for the correlated electron-positron system using the Kahana-type momentum-dependent electron-positron enhancement factors in a local way. For the first time in the theoretical literature the change of the anisotropy direction in the shape of theoretical angular correlation of annihilation radiation (ACAR) spectra for positrons trapped at an Al surface is obtained. The resulting momentum distribution of annihilating pairs is almost isotropic. in agreement with a recent experiment performed in Brookhaven National Laboratory.
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