Abstract
The dynamical structure factor of the K-shell electron of Cu at intermediate momentum transfers is calculated on the basis of both the one-electron and the one-site approximation. The aim is to study the structure of the profile found experimentally by Namikawa and Hosoya [Phys. Rev. Lett. 53, 1606 (1984)] under the condition qa\ensuremath{\approxeq}1, where a is the orbital radius of the K-shell electron of Cu and q is the photon momentum transfer. The structures observed by Namikawa and Hosoya experimentally or those obtained theoretically on the basis of the single-orthogonalized-plane-wave approximation are not found in the present calculation. Indeed, the present theoretical result agrees with the spectral shape obtained experimentally by Manninen, H\am\al\ainen, and Graeffe [Phys. Rev. B 41, 1224 (1990)] and revises the calculation based on the impulse approximation.
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