Abstract
A systematic experimental study of the x-ray coefficient of reflection R/sub c/ of five commonly used acid phthalate crystals has been carried out over the energy range 500--650 eV around the oxygen K edge. Extrapolation of a calibrated continuum x-ray spectrum permitted the evaluation of R/sub c/ within +- 15 percent accuracy. The magnitude of R/sub c/ is strongly influenced by the oxygen photoelectric absorption coefficient. The R/sub c/ data show a strong resonance peak caused by absorption to an unoccupied molecular-orbital state. In addition there are weak Rydberg and molecular-orbital peaks, a continuum shape resonance, and weak extended x-ray absorption fine structure running to 300 eV above the binding energy. Auxiliary data were obtained to aid the interpretation of features in the R/sub c/ curves. These include emission spectra, Auger spectra, electron spectroscopy for chemical analysis, and relative data on R/sub c/ for clinochlore.
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