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[en] It is demonstrated that the atomic model previously shown to give a semi-quantitative account of the heat of formation of transition metal intermetallic compounds, can also offer a relatively simple interpretation of the isomer shift in metallic alloys. The two main terms in the isomer shift are due to (1) electronic charge transfer between more electropositive and more electronegative metal atoms and (2) the discontinuity in the electron density that exists at the boundary between dissimilar atoms if the atoms have similar charge distribution in both alloy and the pure metals. The electron density must become continuous at the cell boundary; this leads to a term in the isomer shift that usually, but not always, opposes the charge transfer term. In solid solutions there is an additional volume (size mismatch) contribution to the isomer shift which, however, is not as important as suggested by some other authors. In addition to experimental results obtained on the isomer shift solid solutions of Au as an impurity in transition metals hosts, we discuss results on Au-base alloys and gold intermetallic compounds. (orig.)
Journal
Physica B plus C; ISSN 0378-4363; 
; v. 100(2); p. 145-156
; v. 100(2); p. 145-156
No abstract available
Source
Robinson, R.L.; McGowan, F.K.; Ball, J.B.; Hamilton, J.H. (eds.); Oak Ridge National Lab., Tenn. (USA); USAEC, Washington, D.C.; Vanderbilt Univ., Nashville, Tenn. (USA); National Science Foundation, Washington, D.C. (USA); International Union of Pure and Applied Physics, London (UK); v. 1 p. 179; ISBN 0720402956; ; 1974; North-Holland Publishing Company; Amsterdam; International conference on reactions between complex nuclei; Nashville, Tenn., USA; 10 Jun 1974; Published in summary form only.
; 1974; North-Holland Publishing Company; Amsterdam; International conference on reactions between complex nuclei; Nashville, Tenn., USA; 10 Jun 1974; Published in summary form only.
[en] Lifetimes of the low-lying excited states in the very neutron-deficient nucleus 175Au have been measured by the recoil-distance Doppler-shift method using γ-ray spectra obtained with the recoil-decay tagging technique. Transition quadrupole moments and reduced transition probabilities extracted for this odd-Z nucleus indicate the existence of three different shapes and the competition between collective and noncollective structures.
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