RECENT STUDIES OF NEAR-EDGE STRUCTURE

The extent to which near-edge structure depends upon long-range order is explored using polymeric systems, where one can vary the dispositio n of side-groups and the degree of crystallinity and compare the resul ting spectra. Carbon K-edges for polystyrene in atactic and isotactic forms are compared; the former is amorphous and the latter crystalline . Differences between the spectra are very slight but observable, and are attributed to bond orientation effects and to interaction between closely-spaced hydrogens bonded to neighbouring benzene rings and to t he backbone. The quality of the spectra collected at doses of less tha n 300 e(-) nm(-2) from a few square microns compares favourably with p reviously published EXAFS data. Another example of near-edge structure is provided by segregated species. The ease of iron segregated to bou ndaries in Zr-Nb alloys is of intense interest to the nuclear industry . An attempt has been made to interpret observed fine structure in ter ms of structure from reference intermetallic compounds. It seems that the fine structure displayed by the segregated iron is different from that displayed by pure metallic iron or by known compounds with Zr, bu t more akin to ZrNbFe.