Dynamic Structure Factor of Diamond and LiF Measured Using Inelastic X-Ray Scattering

W. A. Caliebe; J. A. Soininen; Eric L. Shirley; C.-C. Kao; K. Hämäläinen

doi:10.1103/PhysRevLett.84.3907

Dynamic Structure Factor of Diamond and LiF Measured Using Inelastic X-Ray Scattering

W. A. Caliebe, J. A. Soininen, Eric L. Shirley, C.-C. Kao, and K. Hämäläinen

Phys. Rev. Lett. 84, 3907 – Published 24 April 2000

Abstract

The dynamic structure factors $S (\vec{q}, ω)$ of diamond and LiF have been measured using inelastic x-ray scattering. The experimental data are compared to results of ab initio calculations, which take into account the interaction of the excited electron with the remaining hole. In diamond, the vicinity of the indirect band gap and its momentum dependence are studied. In LiF, a larger energy range, which covers the fundamental exciton, the plasmon, and several interband transitions, is investigated. Calculations and measurements agree quite well and emphasize the need to properly include the interaction of the excited electron in the conduction band with the hole in the valence band.

Received 9 September 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.3907

Authors & Affiliations

W. A. Caliebe^*

Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany

J. A. Soininen^† and Eric L. Shirley

Optical Technology Division, Physics Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899

C.-C. Kao

National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973

K. Hämäläinen

Department of Physics, University of Helsinki, POB 9, FIN-00014, Helsinki, Finland

^*Permanent address: National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973.
^†Permanent address: University of Helsinki, Department of Physics, POB 9, FIN-00014, Helsinki, Finland.