Abstract
Pd K-edge X-ray absorption spectra at several temperatures of Pd 561(phen) 36O 200 and other high nuclearity ligand-stabilized Pd clusters are reported. Data-analysis performed in a wide k-range (up to 17.5 Å −1), accounting for possible effects of asymmetry, allowed us to obtain very reliable results for the nearest neighbour PdPd distribution. Mean bond length and variance are determined as a function of temperature. The data indicate the existence of regular FCC particles with a very weak relaxation with respect to the bulk ideal geometry and no asymmetry effects in the bond length distribution.
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