Theory of X-Ray Thomson Scattering
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چکیده
The scattering of photons in plasmas is an important diagnostic tool. The region of warm dense matter can be probed by x-ray Thomson scattering. This requires intense x-ray sources, such as the free electron laser (FEL) at DESY Hamburg. We improve the standard treatment of the scattering on free electrons within the random phase approximation (RPA) by including collisions. The dynamic collision frequency is calculated in Born approximation and the dielectric function at finite wavenumbers is obtained by using the Mermin ansatz. The inclusion of collisions modifies the dynamic structure factor significantly in the warm dense matter regime. Consequently, a theoretical description beyond RPA is crucial to obtain reliable results for plasma parameters using x-ray Thomson scattering.
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تاریخ انتشار 2005