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Momentum-transfer dependence of x-ray Raman scattering at the Be K-Edge



C Sternemann, M Volmer, J A. Soininen, H Nagasawa, M Paulus, H Enkisch, G Schmidt, M Tolan, W Schulke


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.
Physical Review B (Condensed Matter and Materials Physics)


Beryllium, core-hole, dipole, energy-loss, k-edge, scattering


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 April 14, 2024)
Created July 1, 2003, Updated February 17, 2017