By the use of monochromatized X-rays from synchrotron radiation at Stanford Synchrotron Radiation Laboratory (SSRL), the reflectivity of Cu has been measured to determine the anomalous scattering factors f'(ω) and f''(ω) very near the K absorption edge. The results for f'(ω) and f''(ω) are compared with calculated values by the Hönl's theory, measured values of f''(ω) from the absorption coefficient µ(ω) and calculated values of f'(ω) from µ(ω) through the dispersion relation.
Absorption spectra near the K edge and EXAFS of GaAs were measured at Ibar and 220 kbar to investigate the changes of electronic states and structure accompanied by the covalent-metallic transition. This experiment was carried out by a combination of a diamond anivil high-pressure cell and synchrotron radiation (SR). The absorption edge at 220 kbar clearly indicates the metallic state.
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