Temperature Dependence of X-Ray Absorption by Crystals II. Direct Phonon Absorption

抄録

The part of absorption coefficients of X-rays arising from the phonon excitations is calculated quantum mechanically. When the polarization vectors of the incident X-rays are in the diffraction plane, and are parallel to the direction of diffracted wave, the cross terms of the direct phonon and the photoelectric excitations mainly contribute to the h-wave absorption coefficient (i.e. h-component of the absorption coefficient in the two-wave approximation). It is also concluded that the direct phonon excitation could be significant near the absorption edges.