Tabulations are presented of relativistic Hartree-Fock-8later modified atomic form factors from x = ° to 100 A-I for all elements from Z = 1 to Z = 100. These modified form factors represent the atomic Rayleigh scattering amplitudes with good accuracy at energies well above theK-sheli binding energies and small momentum transfex:s and therefore should be used instead of the normal relativistic atomic form factors In the MeV energy range.

Using linearly polarized synchrotron x rays with energies E=21.2 -43.7 keV, dift'erential cross sections for large-angle elastic photon scattering by Kr and Xe were measured. In the case of Xe, the energy region close to the K-shell binding energy (8~=34.561 keV) was investigated in detail.The experimental results agree well with theoretical predictions based upon the numerical energyshifted second-order S-matrix theory, and with high-energy-limit-corrected anomalous-scatteringfactor predictions.

No abstract

Using monochromatized synchrotron radiation with variable photon energy E i = 33.94 keV... 34.54 keV, Resonant Raman Scattering (RRS) by free Xenon atoms (BI~ =34.566keV) was investigated. The measured double-differential RRS cross sections are in excellent agreement with those calculated in the non-relativistic dipole approximation, modified by some relativistic corrections, and including the interference corrections predicted by Tulkki and ~berg. Within the experimental error of 5 % the RRS cross section is found to be independent of the scattering angle and of the polarization of the incident photons.

No abstract