Abstract
Various approaches to the surface problem that enables one to calculate angular correlation of annihilation radiation (ACAR) spectra are discussed. The validity of the mixed-density approximation (MDA) in the neighborhood of metal surface is investigated. For positrons trapped at the Al surface the MDA gives results that strongly disagree with those obtained using the exact ACAR formula. A new formula for use in calculating surface ACAR spectra, allowing avoidance of this deficiency of the MDA, is proposed.
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