Abstract
The use of extended X-ray absorption fine structure (EXAFS) to determine the interatomic distances in small metal clusters is of considerable scientific as well as technical importance, we have used synchrotron radiation to study the near edge structure as well as the EXAFS spectra of metal clusters isolated in rare-gas matrices, by studying such small metal clusters in inert-gas matrices, it is possible to investigate metal-metal interactions without the interference of strongly interacting supports. Considerable contraction in small metal clusters of iron and chromium consisting of a few atoms has been observed. Associated with this contraction is a large variation in the electronic properties as detected by the isomer shift and magnetic hyperfine field at the 57Fe nucleus. The chromium results are compared with recent gas-phase measurements reported in the literature. EXAFS was also used to determine the interatomic distance for small metal particles of silver isolated in solid argon.
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