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Published February 1, 1974 | public
Journal Article Open

Energy shifts of K x-ray lines for different chemical compounds of Ru, Pr, and Yb


The energy shifts of Kα2, Kα1, Kβ3, Kβ1, and Kβ2 x rays were measured for the following Ru, Pr, and Yb compounds: Ru, Ru(CO2)Cl2, RuO2, [Ru(NH3)4OHCl]Cl · 2H2O, and RuF3; Pr, PrC2, Pr2O3, PrFeO3, Pr6O11, PrO2, CsPrF5, and Cs2PrF6, Yb, YbF3, and Yb2O3. The results are compared with free-ion relativistic self-consistent-field calculations. The measurements bear out the dominant role of the 4f electrons in energy shifts between the trivalent and tetravalent Pr and the divalent and trivalent Yb. In Yb the full free-ion value is observed, while in Pr the free-ion value appears to be attenuated by a factor of 0.4, presumably owing to covalency. In all cases the relation of the x-ray energy shift to the Mössbauer isomer shift is discussed.

Additional Information

©1974 The American Physical Society. Received 24 July 1973. H. Henrikson's contribution in building the spectrometer is gratefully acknowledged. Thanks are due to Dr. K. Gschneidner for a valuable correspondence and to Dr. F. Wagner for the cesium praseodymium fluoride samples. Work performed under the auspices of the U.S. Atomic Energy Commission. Prepared under Contract No. AT[04-3]-63 for the San Francisco Operations Office, U.S. AEC.


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