Abstract
Intense synchrotron light-sources, high resolution spectrometers and modern data acquisition techniques brings back old LIII-absorption spectroscopy into physics and chemistry of rare earth /1,2/. Special interest in LIII-absorption arose in physics of valence fluctuating rare earth systems, since LIII-absorption turned out to be a universally applicable tool for valence determination /3,4/. Since the discovery of the drastic volume collapse at the α-α phase transition in Ce /5/ and Paulings’s suggestion of promotion of one 4f electron in this 15% volume collapse, the degree of 4f occupation in α-Ce has been the subject of lively controversy.KeywordsRare EarthContinuum ThresholdVolume CollapseHigh Resolution SpectrometerData Acquisition TechniqueThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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