L₃-edge anomalous scattering by gadolinium and samarium measured at high resolution with synchrotron radiation

The anomalous scattering terms f' and f'' for Gd and Sm near their L₃ absorption edges, measured in diffraction experiments with synchrotron radiation more nearly monochromatic than the natural level widths, show even larger effects than earlier measurements with a larger X-ray bandwidth. A test of angular dependence shows f' for Sm to decrease in magnitude with increasing diffraction angle, while f'' is essentially constant.