Caliebe WA, Soininen JA, Shirley EL, Kao C, Hamalainen K
Institut fur Festkorperforschung, Forschungszentrum Julich, 52425 Julich, Germany.
Phys Rev Lett. 2000 Apr 24;84(17):3907-10. doi: 10.1103/PhysRevLett.84.3907.
The dynamic structure factors S(q-->,omega) 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.
利用非弹性X射线散射测量了金刚石和LiF的动态结构因子S(q,ω)。将实验数据与从头算结果进行了比较，该计算考虑了激发电子与剩余空穴的相互作用。在金刚石中，研究了间接带隙附近及其动量依赖性。在LiF中，研究了一个更大的能量范围，该范围涵盖了基本激子、等离子体激元和几个带间跃迁。计算和测量结果吻合得很好，并强调了在导带中正确包含激发电子与价带中空穴相互作用的必要性。
