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Momentum-transfer dependence of x-ray Raman scattering at the Be K-Edge
Published
Author(s)
C Sternemann, M Volmer, J A. Soininen, H Nagasawa, M Paulus, H Enkisch, G Schmidt, M Tolan, W Schulke
Abstract
Inelastic x-ray scattering spectra have been measured for energy losses around the Be K-edge in order to perform a systematic study of the dependence of the corresponding dynamic structure factor on both the absolute value and the direction of the momentum transfer. The measured x-ray Raman spectra show clear differences between spectra of different momentum transfer which are related to deviations from the dipole approximation of the x-ray Raman scattering cross section with increasing momentum transfer. In particular, the diffractional differences between x-ray Raman spectra for momentum transfer parallel and perpendicular to the c-axis of single-crystal Be vanish completely at high momentum transfer. These results are attributed to momopole transitions of the excited electrons to s-type final states according to the results of a first-principles calculation which takes the particle-hole interaction into account. This theoretical approach is a valuable tool for modeling x-ray Raman spectra.
Citation
Physical Review B (Condensed Matter and Materials Physics)
Sternemann, C.
, Volmer, M.
, Soininen, J.
, Nagasawa, H.
, Paulus, M.
, Enkisch, H.
, Schmidt, G.
, Tolan, M.
and Schulke, W.
(2003),
Momentum-transfer dependence of x-ray Raman scattering at the Be K-Edge, Physical Review B (Condensed Matter and Materials Physics)
(Accessed October 11, 2025)