Abstract
A study of the LIII X-ray absorption spectra of the rare earths Nd(Z=60), Sm(Z=62), Gd(Z=64), Dy(Z=66), and Yb(Z=70) in their sesquioxides is reported. The preabsorption observed in the spectra of Sm and Gd is attributed to the vacancies created in the 4f levels due to exposure of the sample of continuous X-rays. The near-edge structure of the spectra is interpreted on the basis of molecular orbital levels in these systems. The metal-oxygen average bond lengths are calculated using the Levy method and the results are found to be in good agreement with those obtained using a diffraction technique. The variation of bond lengths across the rare-earth series is discussed.
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