Abstract
Abstract L III -XANES measurements of Sm in an inert Ar-matrix show a continuous increase of the Sm valence with increasing Sm concentration. A sharp transition region is observed near c = 1:100 where the valence steeply rises from 2.05 to a breakpoint v = 2.6. Tempering of a matrix results in a rise of the valence. There is strong evidence that the Sm-Sm interaction in small clusters is responsible for the valence change.
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