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Published December 1, 1978 | public
Journal Article Open

Dependence of the K x-ray energy upon the mode of excitation


The energy of the Ta Kα x rays emitted after electron capture of 181W has been observed to be lower by 0.79±0.06 eV compared to the fluorescent Ta Kα x rays. Similarly, it was found that the Ta Kα x rays emitted after internal conversion following β decay of 181Hf were higher by 0.7±0.1 eV in energy compared to the same fluorescent Ta x rays. The observed effects cannot be explained by the known mechanisms of chemical shift, hyperfine effects, isomer shifts, and shake-off effects alone. Similar observations of the K-x-ray energy shifts in the electron-capture decays of 153Gd and 175Hf with the corresponding fluorescent x rays in Eu and Lu, respectively, can be accounted for by the hyperfine effects, isotope shifts, and chemical shifts.

Additional Information

©1978 The American Physical Society Received 20 July 1978 We wish to acknowledge the generous help of H.E. Henrikson. This work was supported by the U.S. Dept. of Energy under Contract No. EY-76-C-03-0063.


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