Resonant x-ray scattering from chiral materials: α-quartz, α-berlinite, and tellurium

Workshop on Resonant Elastic X-ray Scattering in Condensed Matter 2013

Takahashi, Manabu^1 ; Igarashi, Jun-Ichi^2

Faculty of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan^1

Faculty of Science, Ibaraki University, Ibaraki 310-8512, Mito, Japan^2

关键词: Band structure calculation;    Bond orbital models;    Calculated spectrum;    Intermediate state;    Photon polarization;    Resonant X-ray scattering;    Scattering matrices;    Spectral intensity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/519/1/012009/pdf
DOI  :  10.1088/1742-6596/519/1/012009

来源: IOP

【 摘 要 】

We study the resonant x-ray scattering (RXS) at Si K, Al K and Te L1-edges from chiral materials, α-quartz, α-berlinite, and tellurium. For the forbidden reactions (001) and (001), we deduce the scattering matrix for the E1E1 event by summing up the local scattering matrices. The oscillation terms proportional to cos (3ψ±δ) and sin (3ψ±δ) are obtained in the spectral intensity as a function of azimuthal angle ψ with an expression of possible phase shift δ. We evaluate the parameters which cannot be determined in the symmetry argument on the basis of underlying electronic structures given by the bond-orbital model calculation for α- quartz and α-berlinite, and by using the FLAPW band structure calculation based on the local density approximation for tellurium. The calculated spectra reproduce well the experimental results which depend on photon polarization and crystal chirality. We point out that the nite core-hole life-time and the band effect in the intermediate states may cause together the phase shift δ.